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Pensions and Other Postretirement Benefits - Additional Information (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Pension Benefit Plans      
Employer Contributions      
Company's contributions to its pension plans $ 39.8 $ 42.0 $ 53.4
Pension Benefit Plans | Minimum      
Employer Contributions      
Expected contributions 40.0    
Pension Benefit Plans | Maximum      
Employer Contributions      
Expected contributions 60.0    
Postretirement Health Care Benefits      
Employer Contributions      
Benefit payments made 0.5 $ 1.3 $ 2.8
Expected benefit payments $ 3.0