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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |  | 1 Months Ended
--- | --- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011 | Mar. 31, 2012 Restricted stock units (RSUs) | Mar. 31, 2012 Performance-based restricted stock unit awards
Equity |  |  |  |  |
Issuance of common stock in connection with the exercise of stock options (in shares) | 114,416 |  |  |  |
Total proceeds from the exercise of stock options | $ 4.6 | $ 3.9 |  |  |
Share Based Compensation |  |  |  |  |
Restricted stock granted (in shares) |  |  |  | 391,050 | 138,700
Right to receive number common stock (in shares) |  |  |  | 1 |
Fair value of restricted stock granted (in dollars per share) |  |  |  | $ 57.42 |
Share Repurchase Program |  |  |  |  |
Remaining number of common stock authorized for repurchase under stock repurchase program (in shares) | 7,883,033 |  |  |  |
Accumulated Other Comprehensive (Loss) Income |  |  |  |  |
Foreign currency translation gain | 18.0 |  | 10.4 |  |
Unrealized loss on investments, net of tax | (0.2) |  | (0.4) |  |
Minimum pension liability, net of tax | (18.8) |  | (18.8) |  |
Total accumulated other comprehensive loss | (1.0) | 6.7 | (8.8) |  |
Deferred tax assets in accumulated other comprehensive income, unrealized loss on investments | 0.1 |  | 0.1 |  |
Deferred tax assets in accumulated other comprehensive income, pension liabilities | $ 11.5 |  | $ 11.5 |  |

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