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Employee Benefit Plans - Summary of the Sensitivity of Retirement Obligations and Retirement Benefit Costs of Plans to Changes in the Key Assumptions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Pension Plans    
Estimated increase (decrease) in 2017 pension cost    
0.50% increase in discount rate $ (0.8)  
0.50% decrease in discount rate 0.9  
0.50% increase in long-term return on assets (0.7)  
0.50% decrease in long-term return on assets 0.7  
Estimated increase (decrease) in Projected Benefit Obligation for the year ended December 31, 2016    
0.50% increase in discount rate   $ (13.6)
0.50% decrease in discount rate   14.9
Postretirement Health and Other    
Estimated increase (decrease) in 2017 pension cost    
0.50% increase in discount rate 0.0  
0.50% decrease in discount rate 0.1  
1% increase in medical trend rates 0.7  
1% decrease in medical trend rates $ (0.3)  
Estimated increase (decrease) in Projected Benefit Obligation for the year ended December 31, 2016    
0.50% increase in discount rate   (1.5)
0.50% decrease in discount rate   1.6
1% increase in medical trend rates   3.7
1% decrease in medical trend rates   $ (3.3)