Segments - Schedule of Reconciliation of the Company's Segment Operating Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Total operating income (loss)	$ 16.9	$ 9.8	$ 42.7	$ (0.1)
Restructuring expense	1.0	3.7	11.0	21.3
Segment Operating Income (Loss)
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Total operating income (loss)	25.6	18.7	73.1	25.2
Unallocated Corporate Expenses
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Total operating income (loss)	(8.3)	(7.0)	(26.5)	(23.1)
Reconciliation of Company’s Segment Operating Income (Loss)
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Total operating income (loss)	16.9	9.8	42.7	(0.1)
Restructuring expense	$ (0.4)	$ (1.9)	$ (3.9)	$ (2.2)