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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011
A 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 |
Closing balance at June 30, 2012 | 12.7 |
Current | (3.2) | (3.2)
Non-current | 9.5 | 9.4
Interest and Penalties [Member] |  |
A 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 |
Closing balance at June 30, 2012 | 0.5 |
Current | (0.3) |
Non-current | 0.2 |
Unrecognized Tax Benefits [Member] |  |
A 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 |
Closing balance at June 30, 2012 | 12.2 |
Current | (2.9) |
Non-current | $ 9.3 |

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- Definition The noncurrent portion of the amount recognized for uncertain tax positions as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 6, 7, 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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