Other Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Other Liabilities Disclosure [Abstract]
Compensation and benefits	$ 92.8	$ 93.2
Accrued bonus and deferred compensation	561.5	568.1
Accrued compensation and benefits	654.3	661.3
Accruals and other liabilities	280.6	328.6
Deferred Revenue	87.7	69.2
Obligations, Fair Value Disclosure	78.2	83.9
Accounts payable	274.3	302.6
Income taxes payable	91.6	78.8
Accounts payable and accrued expenses	$ 812.4	$ 863.1