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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 6 Months Ended |  |  | 1 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | May 16, 2012 | Dec. 31, 2011 | Mar. 31, 2012 Restricted stock units (RSUs) | May 31, 2012 Non-employee director restricted stock award Y | Mar. 31, 2012 Performance-based restricted stock unit awards
Equity |  |  |  |  |  |  |
Issuance of common stock in connection with the exercise of stock options (in shares) | 253,919 |  |  |  |  |  |
Total proceeds from the exercise of stock options | $ 9.7 | $ 9.4 |  |  |  |  |
Number of common stock share authorized before amendment to Restated Articles of Incorporation |  |  | 100,000,000 |  |  |  |
Number of common stock shares authorized | 200,000,000 |  | 200,000,000 | 100,000,000 |  |  |
Share Based Compensation |  |  |  |  |  |  |
Restricted stock granted (in shares) |  |  |  |  | 391,050 | 16,842 | 138,700
Number of years from grant date that recipient is restricted from trading restricted stock (in years) |  |  |  |  |  | 1 |
Right to receive number common stock (in shares) |  |  |  |  | 1 |  |
Fair value of restricted stock granted (in dollars per share) |  |  |  |  | $ 57.42 | $ 49.87 |
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 | 8.8 |  |  | 10.4 |  |  |
Unrealized loss on investments, net of tax | (0.4) |  |  | (0.4) |  |  |
Minimum pension liability, net of tax | (18.8) |  |  | (18.8) |  |  |
Total accumulated other comprehensive loss | (10.4) |  |  | (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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