Subsequent Events (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2014 Subsequent Event [Member]	Oct. 17, 2014 Subsequent Event [Member]	Oct. 20, 2014 Short-term Debt [Member] Subsequent Event [Member]
Subsequent Event [Line Items]
Stock Repurchase Program, Authorized Amount	$ 700.0			$ 700.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	145.9			845.9
Accelerated share repurchase program			450.0
Short-term Debt	$ 229.0	$ 165.9			$ 250.0