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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, 2018
Dec. 31, 2017
Pension    
Amounts Recognized in Balance Sheet    
Accrued liabilities $ (0.1) $ (0.1)
Other long-term liabilities (24.8) (19.5)
Net amount recognized (24.9) (19.6)
Amounts Recognized in Accumulated Other Comprehensive Loss    
Net actuarial gain (loss) (25.6) (21.8)
Prior service credits 0.1 0.2
Net amount recognized $ (25.5) $ (21.6)
Weighted‑Average Assumptions Used to Determine Projected Benefit Obligations    
Discount rate 0.00% 0.00%
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 (0.9) (1.0)
Net amount recognized (1.0) (1.1)
Amounts Recognized in Accumulated Other Comprehensive Loss    
Net actuarial gain (loss) 0.2 0.1
Prior service credits 0.0 0.0
Net amount recognized $ 0.2 $ 0.1
Weighted‑Average Assumptions Used to Determine Projected Benefit Obligations    
Discount rate 0.00% 0.00%
Average rate of increase in compensation 0.00% 0.00%
Initial healthcare cost trend rate 0.00% 0.00%
Ultimate healthcare cost trend rate 0.00% 0.00%