Stockholders' Equity and Earnings per Share (Details 2) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended		24 Months Ended
	Jan. 31, 2015	Nov. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2014	Mar. 31, 2013	Mar. 18, 2013
Stockholders' Equity and Earnings per Share [Abstract]
Cash dividends declared per share of common stock			$ 0.290	$ 0.235	$ 0.870	$ 0.705
Dividend increase percentage		23.00%
Shares to which framework agreement allows open market purchases.								19,859,795
Percentage of Common Stock Purchases in Open Market Granted under Framework Agreement								7.00%
Fair Value per Share of First Tranche of Warrants			54.14		54.14
Fair Value per Share of Second Tranche of Warrants			$ 52.55		$ 52.55
Derivative, Cost of Hedge	$ 100.0						$ 368.7
Percentage of Warrant Dilution Intended to be Hedged with Contract					60.00%
Shares Covered Under Derivative Purchases							27,200,000
Full Value of Warrants			$ 2,421.5		$ 2,421.5				$ 242.4