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Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Schedule of Capitalization, Equity [Line Items] |  |  |  |
Retained earnings | $ 290.1 |  | $ 222.1 |
Noncontrolling interest | (24.4) |  | (19.0) |
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 | 290.1 | 176.0 | 222.1 | 131.0
Net Income (Loss) Attributable to Parent | 68.0 | 45.0 |  |
Noncontrolling Interest |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |
Noncontrolling interest | (24.4) | (14.1) | (19.0) | (9.9)
Net Income (Loss) Attributable to Noncontrolling Interest, Other | $ (5.4) | $ (4.2) |  |

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