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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011
Roll-forward of unrecognized tax benefits and associated accrued interest and penalties |  |
Opening balance at January 1, 2012 | $ 12.6 |
Additions for tax positions of prior periods | 0.1 |
Reductions for tax positions of prior periods | (0.2) |
Closing balance at September 30, 2012 | 12.5 |
Current | (3.0) | (3.2)
Non-current | 9.5 | 9.4
Interest and Penalties [Member] |  |
Roll-forward of unrecognized tax benefits and associated accrued interest and penalties |  |
Opening balance at January 1, 2012 | 0.4 |
Additions for tax positions of prior periods | 0.1 |
Reductions for tax positions of prior periods | 0 |
Closing balance at September 30, 2012 | 0.5 |
Current | (0.3) |
Non-current | 0.2 |
Unrecognized Tax Benefits [Member] |  |
Roll-forward of unrecognized tax benefits and associated accrued interest and penalties |  |
Opening balance at January 1, 2012 | 12.2 |
Additions for tax positions of prior periods | 0 |
Reductions for tax positions of prior periods | (0.2) |
Closing balance at September 30, 2012 | 12.0 |
Current | (2.7) |
Non-current | $ 9.3 |

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