Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

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Debt (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Jun. 28, 2014
Jun. 29, 2013
Dec. 31, 2013
Long-term Debt [Abstract]          
Current maturities of long-term debt $ (5.0) $ (5.2) $ (5.0) $ (5.2) $ (6.4)
Other short-term debt 0 0.8 0 0.8 0
Short-term debt 5.0 6.0 5.0 6.0 6.4
Long-term debt 458.0 471.6 458.0 471.6 459.8
Long-term debt, net of current maturities 453.0 466.4 453.0 466.4 453.4
Extinguishment of Debt [Abstract]          
Long-term debt repurchased   249.8   250.8  
Loss on early extinguishment of debt 0 32.3 0 32.4  
Credit Facility [Abstract]          
Letters of credit outstanding 8.2   8.2    
Senior notes due 2016 [Member]
          
Long-term Debt [Abstract]          
Interest rate   11.25%   11.25%  
Extinguishment of Debt [Abstract]          
Long-term debt repurchased   249.8   249.8  
Notes due 2027 [Member]
          
Extinguishment of Debt [Abstract]          
Long-term debt repurchased   0   1.0  
Notes due 2027 [Member]
          
Long-term Debt [Abstract]          
Long-term debt 162.7 165.0 162.7 165.0 162.7
Interest rate 7.125%   7.125%    
Debt Instruments Maturity Date     2027    
Discount on long-term debt 0.5 0.6 0.5 0.6 0.5
Senior notes due 2021 [Member]
          
Long-term Debt [Abstract]          
Long-term debt 148.7 [1] 150.0 148.7 [1] 150.0 150.0
Interest rate 4.625% 4.625% 4.625% 4.625%  
Debt Instruments Maturity Date     2021    
Discount on long-term debt 0 0 0 0 0
Debentures due 2023 [Member]
          
Long-term Debt [Abstract]          
Long-term debt 103.2 [1] 108.4 103.2 [1] 108.4 103.7
Interest rate 7.375%   7.375%    
Debt Instruments Maturity Date     2023    
Discount on long-term debt 0.2 0.3 0.2 0.3 0.2
Loan With Fond Du Lac County Economic Development Corporation due 2021 [Member]
          
Long-term Debt [Abstract]          
Long-term debt 36.1 40.4 36.1 40.4 36.8
Interest rate 2.00%   2.00%    
Debt Instruments Maturity Date     2021    
Discount on long-term debt 5.6 6.3 5.6 6.3 5.9
Notes payable through 2022 [Member]
          
Long-term Debt [Abstract]          
Long-term debt 7.3 7.8 7.3 7.8 6.6
Interest rate, maximum     5.892%    
Debt Instruments Maturity Date     2022    
Secured Facility [Member]
          
Credit Facility [Abstract]          
Maximum borrowing capacity 300.0   300.0    
Available borrowing capacity 293.8   293.8    
Borrowings under the Facility     0    
Letters of credit outstanding 6.2   6.2    
Maximum amount of letters of credit allowed $ 100.0   $ 100.0    
Facility fee     0.25%    
LIBOR borrowing spread     1.50%    
Base Rate Spread     0.50%    
Minimum Interest Coverage Ratio Covenant 3.5   3.5    
Maximum Leverage Ratio Covenant 3.0   3.0    
Maximum Leverage Ratio Covenant following twelve months for acquisitions over $100 million 3.25   3.25    
Leverage Ratio Investment Grade Conditions 2.25   2.25    
Minimum [Member] | Secured Facility [Member]
          
Credit Facility [Abstract]          
Facility fee     0.20%    
Facility fee when Company achieves Investment Grade Release Conditions     0.125%    
LIBOR borrowing spread     1.30%    
Base Rate Spread     0.30%    
LIBOR Borrowing Spread Investment Grade Release Conditions     1.00%    
Base Rate Spread Investment Grade Release Conditions     0.00%    
Maximum [Member] | Secured Facility [Member]
          
Credit Facility [Abstract]          
Facility fee     0.35%    
Facility fee when Company achieves Investment Grade Release Conditions     0.35%    
LIBOR borrowing spread     1.90%    
Base Rate Spread     0.90%    
LIBOR Borrowing Spread Investment Grade Release Conditions     1.90%    
Base Rate Spread Investment Grade Release Conditions     0.90%    
[1] Included in Senior notes, 4.625% due 2021 and Debentures, 7.375% due 2023 at June 28, 2014, is the estimated aggregate fair value related to the fixed-to-floating interest rate swaps as discussed in Note 5 – Financial Instruments.