Annual report pursuant to Section 13 and 15(d)

Postretirement Benefits Contributions, Benefit Payments and Other (Details)

v3.6.0.2
Postretirement Benefits Contributions, Benefit Payments and Other (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Expected Benefit Payments [Abstract]      
Defined Benefit Plan Estimated Future Employer Required Contributions In Next Fiscal Year Qualified Plan $ 70.0    
Defined Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year Unfunded Plan 3.8    
Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Settlements, Plan Assets 125.2 $ 191.8 $ 71.9
Defined Benefit Plan, Accumulated Benefit Obligation 921.5 1,035.5  
Expected Benefit Payments [Abstract]      
Company Contributions Expected to be Made in 2017 [1] 73.8    
2017 [2] 158.7    
2018 56.8    
2019 56.9    
2020 56.6    
2021 56.0    
2022-2026 270.0    
Other Postretirement Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Settlements, Plan Assets 0.0 $ 0.0  
Expected Benefit Payments [Abstract]      
Company Contributions Expected to be Made in 2017 4.1    
2017 4.1    
2018 3.9    
2019 3.7    
2020 3.4    
2021 3.1    
2022-2026 $ 13.2    
[1] The Company anticipates contributing approximately $70.0 million to fund the qualified pension plans and approximately $3.8 million to cover benefit payments in the unfunded, nonqualified pension plan in 2017. Company contributions are subject to change based on market conditions or Company discretion.
[2] (B) Expected benefit payments in 2017 include payments in connection with the Hourly Plan and Muskegon Plan terminations.