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Employee Retirement Benefits - Amounts Recognized in Balance Sheet and Other Comprehensive Income and Assumptions Used (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Pension    
Amounts Recognized in Balance Sheet    
Accrued liabilities $ (0.1) $ (0.2)
Other long-term liabilities (19.5) (16.0)
Net amount recognized (19.6) (16.2)
Amounts Recognized in Accumulated Other Comprehensive Loss    
Net actuarial gain (loss) (21.8) (24.2)
Prior service credits 0.2 0.2
Net amount recognized $ (21.6) $ (24.0)
Weighted‑Average Assumptions Used to Determine Projected Benefit Obligations    
Discount rate 3.60% 4.10%
Average rate of increase in compensation 0.00% 0.00%
Postretirement    
Amounts Recognized in Balance Sheet    
Accrued liabilities $ (0.1) $ (0.1)
Other long-term liabilities (1.0) (0.9)
Net amount recognized (1.1) (1.0)
Amounts Recognized in Accumulated Other Comprehensive Loss    
Net actuarial gain (loss) 0.1 0.1
Prior service credits 0.0 0.0
Net amount recognized $ 0.1 $ 0.1
Weighted‑Average Assumptions Used to Determine Projected Benefit Obligations    
Discount rate 3.50% 4.00%
Average rate of increase in compensation 0.00% 0.00%
Initial healthcare cost trend rate 6.40% 6.70%
Ultimate healthcare cost trend rate 4.50% 4.50%