Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	$ 723.6	$ 527.2	$ 1,394.3	$ 1,018.7
Operating profit	211.3	103.6	386.9	191.6
Stock-based compensation expense			(16.2)	(17.7)
Cost investment activity			(2.2)
Other expense, net	0.3	1.6	1.0	3.1
Income before income taxes	211.0	102.0	385.9	188.5
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit	234.9	132.7	433.9	238.7
Intersegment sales elimination
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	(0.1)	(0.1)	(0.2)	(0.2)
Corporate and Unallocated
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit	(23.6)	(29.1)	(47.0)	(47.1)
Stock-based compensation expense	(10.3)	(12.3)	(16.2)	(17.7)
Corporate general costs	(13.4)	(14.4)	(27.3)	(27.0)
Restructuring and severance related charges	(1.0)	(2.2)	(2.2)	(2.2)
Amortization of Acquisition-related Intangible Assets	(0.2)	(0.2)	(0.4)	(0.2)
Cost investment activity	1.3	0.0	(0.9)	0.0
Proprietary Products | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	587.3	399.5	1,131.0	773.0
Operating profit	216.2	112.2	398.8	205.4
Contract-Manufactured Products | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	136.4	127.8	263.5	245.9
Operating profit	$ 18.7	$ 20.5	$ 35.1	$ 33.3