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Capital Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Common stock, authorized (in shares) | 500,000,000 | 500,000,000 |
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
Weighted average share outstanding [Abstract] |  |  |
Basic weighted-average common shares outstanding (in shares) | 58,606,000 | 60,600,000 | 62,066,000
Effect of dilutive securities: Stock awards and options (in shares) | 2,842,000 | 2,425,000 | 2,480,000
Diluted weighted-average common shares outstanding (in shares) | 61,448,000 | 63,025,000 | 64,546,000
Securities excluded from the calculation of diluted earnings per share | 1,200,000 | 100,000 | 0
Equity, Class of Treasury Stock [Line Items] |  |  |
Class A common stock repurchased (in shares) | 1,700,000 | 4,600,000 | 1,900,000
Aggregate price of repurchased stock | $ 140.9 | $ 201.5 | $ 67.1
Increment authorized by the Company's board of directors under the stock repurchase program | 400.0 | 250.0 |
Amount available for repurchases | $ 394.5 |  |
Preferred Stock [Member] |  |  |
Preferred stock, authorized (in shares) | 25,000,000 |  |
Preferred stock, par value (in dollars per share) | $ 0.001 |  |
Shares outstanding (in shares) | 0 |  |
Common Class A [Member] |  |  |
Common stock, authorized (in shares) | 500,000,000 |  |
Common stock, par value (in dollars per share) | $ 0.001 |  |
Number of votes class is entitled to | 1 |  |
Number of shares of class A common stock issued after conversion of Class B common stock |  | 1 |
Common Class B [Member] |  |  |
Common stock, authorized (in shares) | 100,000,000 |  |
Common stock, par value (in dollars per share) | $ 0.001 |  |
Shares outstanding (in shares) | 0 |  |
Number of votes class is entitled to | 10 |  |

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