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Stockholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended 12 Months Ended
Mar. 31, 2015
Jun. 30, 2014
Jan. 28, 2015
Apr. 23, 2014
Stockholders' Equity        
Approved stock repurchase program, authorized amount     $ 450us-gaap_StockRepurchaseProgramAuthorizedAmount1 $ 200us-gaap_StockRepurchaseProgramAuthorizedAmount1
Repurchase of common stock (in shares) 5,979,997us-gaap_TreasuryStockSharesAcquired 3,110,114us-gaap_TreasuryStockSharesAcquired    
Repurchase of common stock, amount 224.7us-gaap_TreasuryStockValueAcquiredCostMethod 121.8us-gaap_TreasuryStockValueAcquiredCostMethod    
Remaining capacity under the stock repurchase program $ 375.0us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1     $ 27.4us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1