Segments - Schedule of Reconciliation of the Company's Segment Operating Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Total operating income (loss)	$ 24.1	$ 11.9	$ 25.8	$ (9.9)
Restructuring expense	3.8	5.9	10.0	17.6
Segment Operating Income (Loss)
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Total operating income (loss)	33.5	20.1	47.5	6.5
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)	24.1	11.9	25.8	(9.9)
Unallocated corporate expenses	(8.1)	(8.1)	(18.2)	(16.1)
Restructuring expense	$ (1.3)	$ (0.1)	$ (3.5)	$ (0.3)