Segments - Schedule of Reconciliation of the Company's Segment Operating Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Total operating income (loss)	$ 1.1	$ (153.3)	$ (12.4)
Asset impairment expense	0.1	96.9	15.3
Restructuring expense	27.2	23.4	9.4
Other operating income (expense) - net	(0.1)	(2.6)	0.0
Segment Operating Income (Loss)
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Total operating income (loss)	42.0	(28.8)	54.1
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)	1.1	(153.3)	(12.4)
Unallocated corporate expenses	(36.9)	(42.1)	(62.8)
Asset impairment expense		(77.4)
Restructuring expense	(3.6)	(2.0)	$ (3.7)
Other operating income (expense) - net	$ (0.4)	$ (3.0)