Segment Information Reconciliation of Operating Profit (Loss) from Segments to Consolidated (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]
Segment income	$ 108.4	$ 101.8	$ 323.7	$ 292.9
Restructuring and other	(3.5)	(1.4)	(34.1)	(18.9)
Intangible amortization	(8.6)	(9.2)	(27.0)	(27.2)
Loss on sale of business	(0.2)	(3.8)	(6.4)	(3.8)
Loss on early extinguishment of debt	0.0	0.0	17.1	101.4
Other expense (income)	(2.1)	(1.1)		(3.2)
Income from continuing operations before income taxes	101.8	83.0	274.0	110.3
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income	121.8	120.2	402.9	368.8
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring and other	(3.5)	(1.4)	(34.1)	(18.9)
Intangible amortization	(8.6)	(9.2)	(27.0)	(27.2)
Loss on sale of business	(0.2)	(3.8)	(6.4)	(3.8)
Loss on early extinguishment of debt	0.0	0.0	17.1	101.4
Corporate allocations	0.0	(7.5)	(11.0)	(28.9)
Net interest expense	(4.3)	(13.9)	(27.9)	(74.2)
Other expense (income)	$ (3.4)	$ (1.4)	$ (5.4)	$ (4.1)