Business and Products Information - Net Sales by Product Category (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Net Sales	$ 185.7	$ 171.4	$ 529.8	$ 507.8
Chronic care
Disaggregation of Revenue [Line Items]
Net Sales	119.3	98.0	355.2	300.3
Pain management
Disaggregation of Revenue [Line Items]
Net Sales	$ 66.4	$ 73.4	$ 174.6	$ 207.5