Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Provision for/(benefit from) income taxes	$ 544.0	$ (983.0)	$ 698.0	$ (439.0)	$ 1,283.0
Effective tax rate (as a percent)		(95.10%)		(10.80%)
Other (income) and expense
Pre-tax impairment charge related to land, buildings and furniture and fixtures		$ 252.0
Noncontrolling interest amounts, net of tax	$ 3.0		$ 2.4	$ 4.4	$ 3.5