Fair Value Measurements (Details 1) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Notes payable, carrying value	$ 6,524.0	$ 6,506.5
Debt instruments, fair value	7,110.9	6,645.9
Notes Payable to Fumedica
Debt Instrument [Line Items]
Notes payable, fair value	6.4	9.4
Notes payable, carrying value	6.1	9.0
6.875% Senior Notes due 2018
Debt Instrument [Line Items]
Notes payable, fair value	598.2	602.6
Notes payable, carrying value	561.9	565.3
2.900% Senior Notes due 2020
Debt Instrument [Line Items]
Notes payable, fair value	1,561.7	1,497.5
Notes payable, carrying value	1,507.9	1,485.5
3.625% Senior Notes due 2022
Debt Instrument [Line Items]
Notes payable, fair value	1,061.0	1,014.2
Notes payable, carrying value	992.7	992.2
4.050% Senior Notes due 2025
Debt Instrument [Line Items]
Notes payable, fair value	1,887.3	1,764.6
Notes payable, carrying value	1,734.1	1,733.4
5.200% Senior Notes due 2045
Debt Instrument [Line Items]
Notes payable, fair value	1,996.3	1,757.6
Notes payable, carrying value	$ 1,721.3	$ 1,721.1