Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Oct. 04, 2018
Operating Leased Assets [Line Items]
Pre-tax restructuring costs		$ 12.0	$ 20.3	$ 35.0
Expected cost remaining		7.9
Accrual for environmental loss contingencies		8.5	4.9
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating lease rent expense		44.8	$ 30.5	$ 28.8
Due in 2019		23.5
Due in 2020		21.0
Due in 2021		16.5
Due in 2022		13.2
Due in 2023		10.5
Due thereafter		$ 26.5
Maximum
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating lease, contract term		10 years
Withdrawal from Multiemployer Defined Benefit Plan
Operating Leased Assets [Line Items]
Pre-tax restructuring costs	$ 12.5
Expected cost remaining		$ 23.0
Arbitration Proceeding - Multiemployer Defined Benefit Plan Withdrawal
Operating Leased Assets [Line Items]
Additional payment					$ 23.3