Fair Value Measurements (Details 1) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Notes payable, carrying value	$ 6,514.3	$ 583.4
Debt instruments, fair value	6,680.0	647.2
Notes Payable to Fumedica
Debt Instrument [Line Items]
Notes payable, fair value	9.5	12.6
Notes payable, carrying value	9.1	11.7
6.875% Senior Notes due 2018
Debt Instrument [Line Items]
Notes payable, fair value	614.0	634.6
Notes payable, carrying value	566.9	571.7
2.900% Senior Notes due 2020
Debt Instrument [Line Items]
Notes payable, fair value	1,514.1	0.0
Notes payable, carrying value	1,492.3	0.0
3.625% Senior Notes due 2022
Debt Instrument [Line Items]
Notes payable, fair value	1,008.4	0.0
Notes payable, carrying value	991.9	0.0
4.050% Senior Notes due 2025
Debt Instrument [Line Items]
Notes payable, fair value	1,767.1	0.0
Notes payable, carrying value	1,733.1	0.0
5.200% Senior Notes due 2045
Debt Instrument [Line Items]
Notes payable, fair value	1,766.9	0.0
Notes payable, carrying value	$ 1,721.0	$ 0.0