Deferred Revenue - Schedule of deferred revenue (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Current portion:
Deferred revenue, current	$ 591.7	$ 452.5
Noncurrent portion:
Deferred revenue, noncurrent	619.0	464.2
Sanofi
Current portion:
Deferred revenue, current	395.5	246.7
Noncurrent portion:
Deferred revenue, noncurrent	509.7	279.3
Bayer
Current portion:
Deferred revenue, current	49.2	44.4
Noncurrent portion:
Deferred revenue, noncurrent	73.8	45.1
Teva
Current portion:
Deferred revenue, current	89.5	92.5
Noncurrent portion:
Deferred revenue, noncurrent	24.9	102.0
Other
Current portion:
Deferred revenue, current	57.5	68.9
Noncurrent portion:
Deferred revenue, noncurrent	$ 10.6	$ 37.8