Segment Information - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income	$ 161.8	$ 111.1	$ 318.9	$ 211.8
Loss on sale of businesses	0.0	(0.1)	0.0	(0.1)
Net interest expense	(3.8)	(7.7)	(8.9)	(14.6)
Other expense (income)	(0.3)	0.3	(0.7)	(0.9)
Income from continuing operations before income taxes	157.7	103.6	309.3	196.2
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income	174.9	124.7	339.3	236.2
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Deal related costs and expenses	(1.0)	0.0	(1.7)	(0.4)
Restructuring, transformation and other costs	(5.8)	(1.1)	(7.3)	(3.5)
Intangible amortization	(6.3)	(7.0)	(13.4)	(14.6)
Loss on sale of businesses	0.0	(0.1)	0.0	(0.1)
COVID-19 related costs and expenses	(0.1)	(4.8)	(0.3)	(5.7)
Legal Accrual Adjustments	0.0		2.4
Net interest expense	(3.8)	(7.7)	(8.9)	(14.6)
Other expense (income)	$ (0.2)	$ (0.4)	$ (0.8)	$ (1.1)