Fair Value Measurements (Details 1) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Summary of fair and carrying value of debt instruments
Total fair value	$ 6,645.9	$ 647.2
Notes Payable to Fumedica
Summary of fair and carrying value of debt instruments
Notes payable, fair value	9.4	12.6
6.875% Senior Notes due 2018
Summary of fair and carrying value of debt instruments
Notes payable, fair value	602.6	634.6
2.90% Senior Notes due 2020
Summary of fair and carrying value of debt instruments
Notes payable, fair value	1,497.5	0.0
3.625% Senior Notes due 2022
Summary of fair and carrying value of debt instruments
Notes payable, fair value	1,014.2	0.0
4.05% Senior Notes due 2025
Summary of fair and carrying value of debt instruments
Notes payable, fair value	1,764.6	0.0
5.20% Senior Notes due 2045
Summary of fair and carrying value of debt instruments
Notes payable, fair value	$ 1,757.6	$ 0.0