Segments - Schedule of Reconciliation of the Company's Segment Operating Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Total operating income (loss)	$ 17.8	$ 32.5	$ 41.9	$ 16.2	$ (62.0)	$ 16.9	$ 24.1	$ 1.7	$ 108.4	$ (19.3)	$ 8.4
Restructuring expense									9.8	12.9	27.2
Segment Operating Income (Loss)
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Total operating income (loss)									139.8	22.1	45.0
Corporate
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Total operating income (loss)									(31.3)	(37.5)	(33.0)
Reconciliation of Company's Segment Operating Income
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Total operating income (loss)									108.4	(19.3)	8.4
Restructuring expense									$ (0.1)	$ (3.9)	$ (3.6)