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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
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Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2016	Oct. 04, 2018
Loss Contingencies [Line Items]
Restructuring charges	$ 3.0	$ 0.7
Expected costs remaining	7.0
Arbitration Proceeding - Multiemployer Defined Benefit Plan Withdrawal
Loss Contingencies [Line Items]
Additional payment				$ 23.3
Withdrawal from Multiemployer Defined Benefit Plan
Loss Contingencies [Line Items]
Restructuring charges			$ 12.5
Expected costs remaining	$ 23.0