Segment Information Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Sep. 26, 2015	Dec. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income	$ 67.6	$ 92.7
Restructuring and other	(1.1)	(5.6)
Intangible amortization	(8.2)	(9.3)
Asset Impairment	(15.3)	0.0	$ 0.0	$ (15.3)
Gain (loss) on sale of business	3.5	(5.3)
Other expense		(0.4)
Income from continuing operations before income taxes	63.2	73.5
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income	98.7	117.0
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring and other	(1.1)	(5.6)
Intangible amortization	(8.2)	(9.3)
Gain (loss) on sale of business	3.5	(5.3)
Corporate allocations	0.0	(8.8)
Net interest expense	(7.3)	(13.5)
Other expense	(1.2)	(1.0)
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Deal related costs and expenses	(4.2)	0.0
Inventory step-up	$ (1.7)	$ 0.0