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Employee Benefits - Defined Contribution Benefit Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2015
Defined Contribution Benefit Plans        
Total costs incurred for defined contribution benefit plans $ 44.3 $ 48.0 $ 14.2  
New 401k Contribution for new hires       6.00%
Pension Benefits        
Employee Benefit Plans        
Expected contributions to the plans during the next fiscal year 100.0      
Expected payments, reflecting expected future service        
2017 215.7      
2018 217.1      
2019 226.5      
2020 233.1      
2021 230.0      
2022 through 2026 1,031.5      
OPEB        
Employee Benefit Plans        
Expected contributions to the plans during the next fiscal year 0.1      
Expected payments, reflecting expected future service        
2017 41.8      
2018 49.6      
2019 49.0      
2020 50.9      
2021 53.1      
2022 through 2026 $ 278.5