Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Provision for/(benefit from) income taxes	$ 409.0	$ (983.0)	$ 659.0	$ (31.0)	$ 1,943.0
Effective tax rate (as a percent)		(95.10%)		(0.40%)
Other (income) and expense
Noncontrolling interest amounts, net of tax	$ 3.1		$ 2.4	$ 7.5	$ 5.9