Annual report pursuant to Section 13 and 15(d)

Postretirement Benefits Contributions, Benefit Payments and Other (Details)

v3.3.1.900
Postretirement Benefits Contributions, Benefit Payments and Other (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Expected Benefit Payments [Abstract]    
Amortization of prior service costs (credits) for former/inactive employees $ 0.6 $ 1.3
Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Accumulated Benefit Obligation 1,035.5 $ 1,315.4
Expected Benefit Payments [Abstract]    
Company contributions expected to be made in 2015 [1] 38.8  
2015 73.0  
2016 73.5  
2017 73.4  
2018 73.0  
2019 72.2  
2020-2024 345.8  
Defined Benefit Plan Estimated Future Employer Required Contributions In Next Fiscal Year Qualified Plan 35.0  
Defined Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year Unfunded Plan 3.8  
Other Postretirement Benefit Plans [Member]    
Expected Benefit Payments [Abstract]    
Company contributions expected to be made in 2015 [1] 4.4  
2015 4.4  
2016 4.2  
2017 4.0  
2018 3.8  
2019 3.5  
2020-2024 $ 13.3  
[1] The Company currently anticipates contributing approximately $35.0 million to fund the qualified pension plans and approximately $3.8 million to cover benefit payments in the unfunded, nonqualified pension plan in 2016. Company contributions are subject to change based on market conditions or Company discretion.