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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2013
Income Tax Disclosure [Abstract] |
Roll-Forward of Unrecognized Tax Benefits and Associated Accrued Interest and Penalties | A roll-forward of unrecognized tax benefits and associated accrued interest and penalties is as follows:
(in millions) |  | Interest and Penalties |  |  | Unrecognized Tax Benefits |  |  | Total |
Opening balance at January 1, 2013 |  | $ | 0.6 |  |  | $ | 12.2 |  |  | $ | 12.8 |
Additions for tax positions of prior periods |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.2 |
Reductions due to lapsed statutes of limitations |  |  | (0.1 | ) |  |  | (0.5 | ) |  |  | (0.6 | )
Closing balance at June 30, 2013 |  |  | 0.6 |  |  |  | 11.8 |  |  |  | 12.4 |
Current |  |  | (0.1 | ) |  |  | (2.3 | ) |  |  | (2.4 | )
Non-current |  | $ | 0.5 |  |  | $ | 9.5 |  |  | $ | 10.0 |

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- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=32707879&loc=d3e36027-109320 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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