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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Abstract] |
Accumulated other comprehensive income (loss) | The components of Accumulated other comprehensive income, net of tax, were as follows:
December 31 |  | 2011 |  |  | 2010 |  |  | 2009 |
Foreign currency translation | $ | 54.3 |  | $ | 96.6 |  | $ | 111.0 |
Unrealized gain on investments |  | 8.2 |  |  | 8.0 |  |  | 6.6 |
Defined benefit pension plans (Note 8) |  | (26.5 | ) |  | (19.1 | ) |  | (13.2 | )
Retiree health care plan (Note 8) |  | (0.7 | ) |  | 1.5 |  |  | 2.5 |
Accumulated other comprehensive income | $ | 35.3 |  | $ | 87.0 |  | $ | 106.9 |

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