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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended			6 Months Ended		12 Months Ended
	May. 13, 2015	Feb. 26, 2015	May. 15, 2013	Sep. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Jul. 21, 2015
Common stock dividends paid							$ 93.5	$ 78.6
Dividends declared per common share	$ 0.55	$ 0.55			$ 0.55	$ 0.40	$ 1.10	$ 0.80
Repurchases of common stock							$ 43.3	$ 0.0
Shares of common stock repurchased							603,835
Subsequent Event
Common stock dividends paid				$ 53.8
Share Repurchase Program [Domain]
Remaining authorized amount for share repurchases										$ 205.0
Annual Dividend
Dividends declared per common share			$ 1.60						$ 2.20

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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The cash outflow to reacquire common stock during the period.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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