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Stockholders' Equity Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Retained earnings | $ 501.8 |  | $ 501.8 |  | $ 486.9 |
Noncontrolling interest |  |  |  |  | $ 0.0 |
Net Income (Loss) Attributable to Noncontrolling Interest, Other | $ 0.0 | $ 0.0 | $ 0.0 | $ 3.9 |  |
Authorized capitalization of common stock (in shares) | 300,000,000 |  | 300,000,000 |  | 300,000,000 |
Par value of common stock (in dollars per share) | $ 0.01 |  | $ 0.01 |  |  |
Authorized capitalization of preferred stock (in shares) | 3,500,000 |  | 3,500,000 |  |  |
Par value of preferred stock per share (in dollars per share) | $ 0.01 |  | $ 0.01 |  |  |
Number of shares authorized to be repurchased (in shares) | 10,000,000 |  | 10,000,000 |  |  |
Aggregate number of shares repurchased (in shares) |  |  | 7,600,000 |  |  |
Aggregate cost of shares repurchased |  |  | $ 49.8 |  |  |
Retained Earnings |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Retained earnings | $ 501.8 | 391.0 | 501.8 | 391.0 | $ 486.9 | $ 353.2
Net Income (Loss) Attributable to Parent |  |  | 14.9 | 37.8 |  |
Noncontrolling Interest, Decrease from Deconsolidation |  |  |  | 0.0 |  |
Noncontrolling Interest |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Noncontrolling interest | $ 0.0 | $ 0.0 | 0.0 | 0.0 | $ 0.0 | $ 6.8
Net Income (Loss) Attributable to Noncontrolling Interest, Other |  |  | $ 0.0 | 3.9 |  |
Noncontrolling Interest, Decrease from Deconsolidation |  |  |  | $ (10.7) |  |

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