Segment Information Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income	$ 152.3	$ 140.6
Restructuring and other	(10.8)	(20.9)
Intangible amortization	(24.7)	(24.0)
Loss on sale of business	(5.3)	0.0
Other expense	1.4	2.0
Income from continuing operations before income taxes	131.8	103.6
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income	210.5	185.7
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring and other	(8.3)	(20.9)
Intangible amortization	(24.7)	(24.0)
Loss on sale of business	(5.3)	0.0
Separation costs	(24.6)	0.0
Net interest expense	(13.8)	(35.0)
Other expense	$ (2.0)	$ (2.2)