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Shareholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Jun. 30, 2012 | Sep. 30, 2012 | Dec. 31, 2011 | Nov. 03, 2011 | Dec. 31, 2010
Components of Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |
Foreign currency translation gain (loss) | $ 159.5 |  | $ 159.5 | $ 186.6 |  |
Translation loss on net investment hedge, net of tax | (39.3) |  | (39.3) | (43.2) |  |
Translation loss on long-term intercompany loans | (71.4) |  | (71.4) | (89.1) |  |
Unrealized gain on investments, net of tax | 11.4 |  | 11.4 | 8.2 |  |
Defined benefit pension plans, net of tax | (25.8) |  | (25.8) | (26.5) |  |
Retiree health care plan, net of tax | (0.7) |  | (0.7) | (0.7) |  |
Accumulated other comprehensive income | 33.7 |  | 33.7 | 35.3 |  |
Translation loss on net investment hedge, tax | (24.1) |  | (24.1) | (26.5) |  |
Unrealized gain on investments, tax | 3.8 |  | 3.8 | 2.8 |  |
Defined benefit pension plans, tax | (19.2) |  | (19.2) | (19.5) |  |
Retiree health care plan, tax | $ (0.5) |  | $ (0.5) | $ (0.5) |  |
Share Repurchase Programs [Line Items] |  |  |  |  |  |
Shares authorized to be repurchased (in shares) | 6,000,000 |  | 6,000,000 |  | 3,000,000 | 3,000,000
Shares repurchased (in shares) |  |  | 1,178,897 |  |  |
Dividend declaration date | Oct. 31, 2012 | May 02, 2012 |  |  |  |
Dividend paid (in dollars per share) |  | $ 0.43 |  |  |  |
Dividends payable (in dollars per share) | $ 0.43 |  | $ 0.43 |  |  |
Dividends Paid, Date Paid |  | Jun. 15, 2012 |  |  |  |
Dividends Payable, Date Payable | Dec. 14, 2012 |  |  |  |  |
Dividends Payable, Date of Record | Dec. 04, 2012 | 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 |  | 0 |  |  |
Authorized in 2011 [Member] |  |  |  |  |  |
Share Repurchase Programs [Line Items] |  |  |  |  |  |
Shares repurchased (in shares) |  |  | 559,640 |  |  |
Shares authorized to be repurchased remaining (in shares) | 2,400,000 |  | 2,400,000 |  |  |
Shares repurchased but not settled (in shares) | 450,000 |  | 450,000 |  |  |
Price for repurchased but unsettled shares | $ 16.9 |  | $ 16.9 |  |  |

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