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Stockholders' Equity (Details) (Treasury Stock, USD $)
In Millions, except Share data, unless otherwise specified |
0 Months Ended | 3 Months Ended | |
|---|---|---|---|
|
Mar. 31, 2015
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Mar. 31, 2015
|
Dec. 31, 2014
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Treasury Stock
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| Equity, Class of Treasury Stock [Line Items] | |||
| Amount of shares authorized to be repurchased | $ 205.0 | ||
| Shares repurchased | 3,736,449 | 1,009,700 | |
| Cost of shares repurchased | $ 106.2 | $ 31.1 | |
| Average purchase price | $ 28.41 | $ 30.79 |