Indebtedness (Details) SFr in Millions, $ in Millions	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2006 CHF (SFr)
Current portion:
Financing arrangement for the purchase of the RTP facility	$ 0.0	$ 1.7
Current portion of notes payable and other financing arrangements	3.2	4.7
Non-current portion:
Non-current notes payable	6,003.2
Financing arrangement for the purchase of the RTP facility	0.0	16.4
Non-current portion of notes payable and other financing arrangements	5,935.0	6,512.7
Note payable to Fumedica
Current portion:
Notes payable to Fumedica	3.2	3.0
Non-current portion:
Non-current notes payable	0.0	3.0	SFr 61.4
6.875% Senior Notes due 2018
Non-current portion:
Non-current notes payable	0.0	558.5
2.90% Senior Notes due 2020
Non-current portion:
Non-current notes payable	1,482.4	1,485.3
3.625% Senior Notes due 2022
Non-current portion:
Non-current notes payable	994.3	993.2
4.05% Senior Notes due 2025
Non-current portion:
Non-current notes payable	1,736.3	1,734.8
5.20% Senior Notes due 2045
Non-current portion:
Non-current notes payable	$ 1,722.0	$ 1,721.5