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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)
$ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
Pension Plans  
Estimated increase (decrease) in 2016 pension cost  
0.50% increase in discount rate $ (1.7)
0.50% decrease in discount rate 1.7
0.50% increase in long-term return on assets (1.7)
0.50% decrease in long-term return on assets 1.7
Estimated increase (decrease) in Projected Benefit Obligation for the year ended December 31, 2015  
0.50% increase in discount rate (28.8)
0.50% decrease in discount rate 31.4
Postretirement Health and Other  
Estimated increase (decrease) in 2016 pension cost  
0.50% increase in discount rate (0.1)
0.50% decrease in discount rate 0.0
1% increase in medical trend rates 0.6
1% decrease in medical trend rates (0.2)
Estimated increase (decrease) in Projected Benefit Obligation for the year ended December 31, 2015  
0.50% increase in discount rate (2.1)
0.50% decrease in discount rate 2.2
1% increase in medical trend rates 4.2
1% decrease in medical trend rates $ (3.7)