Business and Products Information - Net Sales by Product Category (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 184.1	$ 185.7	$ 551.2	$ 529.8
Chronic care
Disaggregation of Revenue [Line Items]
Total Net Sales	117.1	119.3	354.2	355.2
Pain management
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 67.0	$ 66.4	$ 197.0	$ 174.6