Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Oct. 31, 2013
Stockholders' Equity Note [Abstract]
Treasury Stock, Value, Acquired, Cost Method	$ 300.1	$ 310.6
Stock Repurchase Program, Authorized Amount			$ 5,000.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 2,650.0