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Stock Transactions Stock Transactions (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Mar. 31, 2015 | Jul. 31, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |
Treasury Stock, Shares, Acquired | 252,642 | 2,538,718 |
Treasury Stock, Value, Acquired, Cost Method | $ 23.5 | $ 230.1 |
Stock Repurchase Program, Authorized Amount | 450.0 | $ 300.0 | $ 150.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 46.4 |  |

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