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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Roll-forward of unrecognized tax benefits and associated accrued interest and penalties |  |
Opening balance at January 1, 2013 | $ 12.8 |
Additions for tax positions of prior periods | 0.2 |
Reductions due to lapsed statutes of limitations | (0.6) |
Closing balance at March 31, 2013 | 12.4 |
Current | (2.4) | (3.0)
Non-current | 10.0 | 9.8
Interest and Penalties [Member] |  |
Roll-forward of unrecognized tax benefits and associated accrued interest and penalties |  |
Opening balance at January 1, 2013 | 0.6 |
Additions for tax positions of prior periods | 0.1 |
Reductions due to lapsed statutes of limitations | (0.1) |
Closing balance at March 31, 2013 | 0.6 |
Current | (0.1) |
Non-current | 0.5 |
Unrecognized Tax Benefits [Member] |  |
Roll-forward of unrecognized tax benefits and associated accrued interest and penalties |  |
Opening balance at January 1, 2013 | 12.2 |
Additions for tax positions of prior periods | 0.1 |
Reductions due to lapsed statutes of limitations | (0.5) |
Closing balance at March 31, 2013 | 11.8 |
Current | (2.3) |
Non-current | $ 9.5 |

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