Segment Information - Sales by Product Group (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Revenue Reconciling Items [Line Items]
Proprietary Products	$ 2,146.9	$ 1,839.9	$ 1,717.4
Operating Segments | Proprietary Products
Segment Reporting, Revenue Reconciling Items [Line Items]
Proprietary Products	1,648.6	1,398.6	1,308.6
Operating Segments | Contract-Manufactured Products
Segment Reporting, Revenue Reconciling Items [Line Items]
Proprietary Products	498.6	441.5	409.1
Intersegment sales elimination
Segment Reporting, Revenue Reconciling Items [Line Items]
Proprietary Products	$ (0.3)	$ (0.2)	$ (0.3)