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Stockholders' Equity Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Capitalization, Equity [Line Items] |  |  |  |
Retained earnings | $ 344.4 |  | $ 353.2 |
Noncontrolling interest | 0 |  | 6.8 |
Net Income (Loss) Attributable to Noncontrolling Interest, Other | 3.9 | (2.3) |  |
Authorized capitalization of common stock (in shares) | 300,000,000 |  | 300,000,000 |
Par value of common stock (in dollars per share) | $ 0.01 |  |  |
Authorized capitalization of preferred stock (in shares) | 3,500,000 |  |  |
Par value of preferred stock per share (in dollars per share) | $ 0.01 |  |  |
Number of shares authorized to be repurchased (in shares) | 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 | 344.4 | 232.5 | 353.2 | 222.1
Net Income (Loss) Attributable to Parent | (8.8) | 10.4 |  |
Noncontrolling Interest, Decrease from Deconsolidation |  |  |  |
Noncontrolling Interest |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |
Noncontrolling interest | 0 | (21.3) | 6.8 | (19.0)
Net Income (Loss) Attributable to Noncontrolling Interest, Other | 3.9 | (2.3) |  |
Noncontrolling Interest, Decrease from Deconsolidation | $ (10.7) |  |  |

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