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Pension Plans (Details 2) (UK Plan [Member], USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Fair value of pension assets |  |  |
Total assets at fair value | $ 718.8 | $ 676.0 |
Cash | 49.8 | 32.8 |
Total plans assets | 768.6 | 708.8 | 672.3
Debt securities issued by U.S. government and government agencies [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 1.6 | 0.9 |
Debt securities issued by non-U.S. government and government agencies [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 191.3 | 221.0 |
Equity Securities Held for Proprietary Investment Purposes [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 134.8 | 114.1 |
Corporate debt securities [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 284.6 | 254.2 |
Residential mortgage-backed securities [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 0.2 | 0.2 |
Other asset-backed securities [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 3.1 | 2.2 |
Real estate [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 33.2 | 26.1 |
Other assets [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 70.0 | 57.3 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 648.8 | 634.2 |
Cash | 49.8 | 32.8 |
Total plans assets | 698.6 | 667.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Debt securities issued by U.S. government and government agencies [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 1.6 | 0.9 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Debt securities issued by non-U.S. government and government agencies [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 191.3 | 221.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities Held for Proprietary Investment Purposes [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 134.8 | 114.1 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate debt securities [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 284.6 | 254.2 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Residential mortgage-backed securities [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 0.2 | 0.2 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other asset-backed securities [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 3.1 | 2.2 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Real estate [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 33.2 | 26.1 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other assets [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value |  | 15.5 |
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 39.0 | 13.7 |
Total plans assets | 39.0 | 13.7 |
Significant Other Observable Inputs (Level 2) [Member] | Debt securities issued by U.S. government and government agencies [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value |  |  |
Significant Other Observable Inputs (Level 2) [Member] | Other assets [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 39.0 | 13.7 |
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 31.0 | 28.1 |
Total plans assets | 31.0 | 28.1 |
Significant Unobservable Inputs (Level 3) [Member] | Debt securities issued by U.S. government and government agencies [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Other assets [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | $ 31.0 | $ 28.1 |

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- Definition This represents the entire assets recognized in the balance sheet that are associated with the defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph c -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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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