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Shareholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011 | Nov. 03, 2011 | Dec. 31, 2010
Components of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Foreign currency translation gain (loss) | $ 151.0 | $ 186.6 |  |
Translation gain (loss) on net investment hedge | (33.8) | (43.2) |  |
Translation gain (loss) on long-term intercopany loans | (64.8) | (89.1) |  |
Unrealized gain (loss) on investments, net of tax | 9.9 | 8.2 |  |
Defined benefit pension plans, net of tax | (26.2) | (26.5) |  |
Retiree health care plan, net of tax | (0.7) | (0.7) |  |
Accumulated other comprehensive income (loss) | 35.4 | 35.3 |  |
Unrealized gain on investments, tax | 3.3 | 2.8 |  |
Defined benefit pension plans, tax | 19.4 | 19.5 |  |
Retiree health care plan, tax | $ 0.5 | $ 0.5 |  |
Share Repurchase Programs [Line Items] |  |  |  |
Shares authorized to be repurchased (in shares) |  |  | 3,000,000 | 3,000,000
Shares repurchased (in shares) | 878,897 |  |  |
Dividend declaration date | May 02, 2012 |  |  |
Dividend paid (in dollars per share) | $ 0.43 |  |  |
Dividends Payable, Date Paid | Jun. 15, 2012 |  |  |
Dividends Payable, Date of Record | Jun. 01, 2012 |  |  |
Authorized in 2010 [Member] |  |  |  |
Share Repurchase Programs [Line Items] |  |  |  |
Shares repurchased (in shares) | 619,257 |  |  |
Shares authorized to be repurchased remaining (in shares) | 0 |  |  |
Authorized in 2011 [Member] |  |  |  |
Share Repurchase Programs [Line Items] |  |  |  |
Shares repurchased (in shares) | 259,640 |  |  |
Shares authorized to be repurchased remaining (in shares) | 2,700,000 |  |  |

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