Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2016	Sep. 30, 2019	Sep. 30, 2018
Loss Contingencies [Line Items]
Restructuring charges	$ 5.2	$ 2.4		$ 15.6	$ 3.1
Withdrawal liability	0.0	$ 0.0		$ 22.9	$ 0.0
Withdrawal from Multiemployer Defined Benefit Plan
Loss Contingencies [Line Items]
Restructuring charges			$ 12.5
Withdrawal liability	$ 22.9