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Postretirement Health Care and Life Insurance Benefits (Details 4) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Estimated Future Benefit Payments      
Prior service (cost) credit for the period $ 4.5 $ (10.4) $ (11.4)
Postretirement Health Care and Life Insurance Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Estimated net actuarial loss that will be amortized from accumulated other comprehensive (income) loss 22.0    
Estimated Future Benefit Payments      
Postretirement Benefits, 2017 55.0    
Postretirement Benefits, 2018 56.2    
Postretirement Benefits, 2019 57.0    
Postretirement Benefits, 2020 57.5    
Postretirement Benefits, 2021 61.3    
Postretirement Benefits, Years 2022-2025 290.3    
Prior service (cost) credit for the period $ 9.2