Related Party Transactions (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2009	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Allergan
Related Party Transactions
Accounts receivable		$ 56.4		$ 56.4		$ 63.9
Allergan | Convertible preferred stock
Related Party Transactions
Shares sold (in shares)	2,083,333
Board of Directors
Related Party Transactions
Amount of insurance premium paid to the insurance provider		3.0	$ 1.9	6.0	$ 3.8
Accounts payable		$ 0.0		$ 0.0		$ 0.0