Fair Value Measurements (Details 1) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Notes payable, carrying value	$ 6,496.6	$ 6,499.3
Debt instruments, fair value	7,006.0	6,808.4
Notes Payable to Fumedica
Debt Instrument [Line Items]
Notes payable, fair value	3.3	6.1
Notes payable, carrying value	3.3	6.0
6.875% Senior Notes due 2018
Debt Instrument [Line Items]
Notes payable, fair value	569.9	583.7
Notes payable, carrying value	554.8	558.5
2.900% Senior Notes due 2020
Debt Instrument [Line Items]
Notes payable, fair value	1,531.5	1,521.5
Notes payable, carrying value	1,487.4	1,485.3
3.625% Senior Notes due 2022
Debt Instrument [Line Items]
Notes payable, fair value	1,051.8	1,026.6
Notes payable, carrying value	993.8	993.2
4.050% Senior Notes due 2025
Debt Instrument [Line Items]
Notes payable, fair value	1,853.3	1,796.0
Notes payable, carrying value	1,735.6	1,734.8
5.200% Senior Notes due 2045
Debt Instrument [Line Items]
Notes payable, fair value	1,996.2	1,874.5
Notes payable, carrying value	$ 1,721.7	$ 1,721.5