Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Provision for/(benefit from) income taxes	$ (983.0)	$ 585.0
Effective tax rate (as a percent)	(95.10%)
Other (income) and expense
Pre-tax impairment charge related to land, buildings and furniture and fixtures	$ 252.0
Noncontrolling interest amounts, net of tax	$ 1.3	$ 1.2