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Property and Equipment - Future Minimum Rental Commitments (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Amounts recognized in the combined balance sheet consisted of:      
Accrued retirement benefits $ (106.2) $ (109.1) $ (139.0)
Pension Plans      
Amounts recognized in the combined balance sheet consisted of:      
Noncurrent assets   2.3 2.4
Other current liabilities   (0.3) (0.3)
Accrued retirement benefits   (105.2) (129.2)
Accumulated other comprehensive loss before income taxes   1.3 29.8
Net amount recognized   $ (101.9) $ (97.3)