Related Party Agreements and Transactions - Allocations of Services (Details) - Lilly - Transitional Services Agreement - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Related Party Transaction [Line Items]
Allocation of services	$ 0.0	$ 34.1	$ 0.0	$ 105.2
Cost of sales
Related Party Transaction [Line Items]
Allocation of services	0.0	7.0	0.0	21.8
Research and development
Related Party Transaction [Line Items]
Allocation of services	0.0	0.7	0.0	2.2
Marketing, selling and administrative
Related Party Transaction [Line Items]
Allocation of services	$ 0.0	$ 26.4	$ 0.0	$ 81.2