Segment Information - Segment Financial Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Operating Profit		$ 406.9	$ 296.6	$ 240.3
Stock-based compensation expense		(34.0)	(24.4)	(15.1)
Amortization of Acquisition-related Intangible Assets	$ (0.6)	(4.4)	(3.4)	(2.7)
Tax recovery		0.0	4.7	0.0
Other expense/(income), net		5.6	4.8	(0.4)
Income before income taxes		401.3	291.8	240.7
Assets		2,793.8	2,341.4
Depreciation and Amortization		109.1	103.4	104.4
Capital Expenditures		174.4	126.4	104.7
Operating Segments
Segment Reporting Information [Line Items]
Operating Profit		503.1	362.7	310.7
Tax recovery			4.4
Corporate and Unallocated
Segment Reporting Information [Line Items]
Operating Profit		(96.2)	(66.1)	(70.4)
Stock-based compensation expense		(34.0)	(24.4)	(15.1)
Corporate general costs		(52.1)	(41.9)	(46.2)
Restructuring and severance related charges		(7.0)	(4.9)	(9.1)
Amortization of Acquisition-related Intangible Assets		(0.6)	0.0	0.0
Cost investment impairment		(2.5)	0.0	0.0
Gain on restructuring-related sale of assets		0.0	1.7	1.1
Argentina currency devaluation		0.0	(1.0)	(1.1)
Tax recovery		0.0	4.4	0.0
Assets		583.9	474.8
Depreciation and Amortization		4.1	3.3	3.3
Capital Expenditures		9.9	1.6	1.3
Proprietary Products | Operating Segments
Segment Reporting Information [Line Items]
Operating Profit		434.5	313.6	266.4
Assets		1,798.3	1,480.6
Depreciation and Amortization		84.6	82.2	83.9
Capital Expenditures		139.5	88.7	79.1
Contract-Manufactured Products | Operating Segments
Segment Reporting Information [Line Items]
Operating Profit		68.6	49.1	44.3
Assets		411.6	386.0
Depreciation and Amortization		20.4	17.9	17.2
Capital Expenditures		$ 25.0	$ 36.1	$ 24.3