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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Employee Benefit Plans [Abstract] |
Schedule of Assumptions Used [Table Text Block] |
| Pension Benefits |  | OPEB
| 2012 |  | 2011 |  | 2010 |  | 2012 |  | 2011 |  | 2010
| U.S. |  | U.K |  | U.S. |  | U.K |  | U.S. |  | U.K. |  |  |  |  |  |
Discount rate | 4.01 | % |  | 4.30 | % |  | 5.10 | % |  | 4.65 | % |  | 5.70 | % |  | 5.35 | % |  | 4.05 | % |  | 5.10 | % |  | 5.70 | %
Expected return on plan assets | 7.50 | % |  | 4.35 | % |  | 8.00 | % |  | 4.60 | % |  | 8.00 | % |  | 6.00 | % |  | N/A |  |  | N/A |  |  | N/A |
Rate of compensation increase | 4.00 | % |  | 3.15 | % |  | 4.00 | % |  | 3.25 | % |  | 3.75 | % |  | 3.65 | % |  | 4.00 | % |  | 4.00 | % |  | 3.75 | %
Change in Benefit Obligation and Plan Assets [Table Text Block] |
| Pension Benefits |  | OPEB
| December 31, |  | December 31,
| 2012 |  | 2011 |  | 2012 |  | 2011
| (in millions) |  | (in millions)
Change in benefit obligation |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ | 716.7 |  |  | $ | 665.4 |  |  | $ | 588.4 |  |  | $ | 564.3 |
Service cost | 3.1 |  |  | 4.8 |  |  | 0.4 |  |  | 0.9 |
Interest cost | 35.1 |  |  | 37.1 |  |  | 15.1 |  |  | 17.1 |
Plan amendments | 6.1 |  |  | — |  |  | — |  |  | — |
Actuarial loss (gain) | 97.3 |  |  | 45.5 |  |  | (7.1 | ) |  | 11.4 |
Change in GM portion of OPEB obligation | — |  |  | — |  |  | 2.4 |  |  | 16.2 |
Participant contributions | 0.5 |  |  | 0.6 |  |  | — |  |  | — |
Special and contractual termination benefits | 12.8 |  |  | — |  |  | 18.3 |  |  | — |
Curtailments | — |  |  | (2.5 | ) |  | — |  |  | (10.0 | )
Settlements | — |  |  | — |  |  | (4.7 | ) |  | — |
Benefit payments | (34.2 | ) |  | (33.7 | ) |  | (11.5 | ) |  | (11.5 | )
Currency fluctuations | 5.4 |  |  | (0.5 | ) |  | — |  |  | — |
Net change | 126.1 |  |  | 51.3 |  |  | 12.9 |  |  | 24.1 |
Benefit obligation at end of year | $ | 842.8 |  |  | $ | 716.7 |  |  | $ | 601.3 |  |  | $ | 588.4 |
Change in plan assets |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 441.7 |  |  | $ | 412.4 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets | 57.3 |  |  | 11.0 |  |  | — |  |  | — |
Employer contributions | 225.4 |  |  | 52.0 |  |  | 11.5 |  |  | 11.5 |
Participant contributions | 0.5 |  |  | 0.6 |  |  | — |  |  | — |
Benefit payments | (34.2 | ) |  | (33.7 | ) |  | (11.5 | ) |  | (11.5 | )
Currency fluctuations | 4.7 |  |  | (0.6 | ) |  | — |  |  | — |
Net change | 253.7 |  |  | 29.3 |  |  | — |  |  | — |
Fair value of plan assets at end of year | $ | 695.4 |  |  | $ | 441.7 |  |  | $ | — |  |  | $ | — |
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] |
| Pension Benefits |  | OPEB
| December 31, |  | December 31,
| 2012 |  | 2011 |  | 2012 |  | 2011
| (in millions) |  | (in millions)
Noncurrent Assets | $ | 11.8 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Current liabilities | (1.3 | ) |  | (1.2 | ) |  | (28.6 | ) |  | (29.4 | )
Noncurrent liabilities | (157.9 | ) |  | (273.8 | ) |  | (572.7 | ) |  | (559.0 | )
Net liability | $ | (147.4 | ) |  | $ | (275.0 | ) |  | $ | (601.3 | ) |  | $ | (588.4 | )
Schedule of Pre-tax Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
| Pension Benefits |  | OPEB
| December 31, |  | December 31,
| 2012 |  | 2011 |  | 2012 |  | 2011
| (in millions) |  | (in millions)
Net actuarial gain (loss) | $ | (298.6 | ) |  | $ | (230.3 | ) |  | $ | 3.3 |  |  | $ | (1.8 | )
Net prior service credit (cost) | (4.7 | ) |  | 0.9 |  |  | 11.8 |  |  | 13.6 |
Deferred curtailment gain | — |  |  | — |  |  | — |  |  | 22.0 |
Total amounts recorded | $ | (303.3 | ) |  | $ | (229.4 | ) |  | $ | 15.1 |  |  | $ | 33.8 |
Schedule of Net Benefit Costs [Table Text Block] |
| Pension Benefits |  | OPEB
| 2012 |  | 2011 |  | 2010 |  | 2012 |  | 2011 |  | 2010
| (in millions) |  | (in millions)
Service cost | $ | 3.1 |  |  | $ | 4.8 |  |  | $ | 4.9 |  |  | $ | 0.4 |  |  | $ | 0.9 |  |  | $ | 1.0 |
Interest cost | 35.1 |  |  | 37.1 |  |  | 36.8 |  |  | 15.1 |  |  | 17.1 |  |  | 16.1 |
Expected asset return | (34.7 | ) |  | (31.9 | ) |  | (31.8 | ) |  | — |  |  | — |  |  | — |
Amortized actuarial loss (gain) | 7.8 |  |  | 4.5 |  |  | 2.5 |  |  | 0.6 |  |  | 0.4 |  |  | (1.4 | )
Amortized prior service cost (credit) | 0.5 |  |  | (0.1 | ) |  | — |  |  | (2.0 | ) |  | (3.2 | ) |  | (3.1 | )
Special and contractual |  |  |  |  |  |  |  |  |  |  |
termination benefits | 12.8 |  |  | — |  |  | — |  |  | 16.2 |  |  | — |  |  | — |
Curtailments | — |  |  | — |  |  | 0.2 |  |  | (21.8 | ) |  | — |  |  | — |
Settlement | — |  |  | 0.1 |  |  | — |  |  | (5.2 | ) |  | — |  |  | — |
Net periodic benefit cost | $ | 24.6 |  |  | $ | 14.5 |  |  | $ | 12.6 |  |  | $ | 3.3 |  |  | $ | 15.2 |  |  | $ | 12.6 |
Schedule of Weighted Average Allocation of Pension Plan Assets [Table Text Block] |
| U.S. |  | U.K.
|  |  | Target |  |  |  | Target
| 2012 |  | 2011 |  | Allocation |  | 2012 |  | 2011 |  | Allocation
Equity securities | 38.3 | % |  | 50.8 | % |  | 35% - 65% |  | 34.8 | % |  | 44.5 | % |  | 30% - 40%
Fixed income securities | 52.3 |  |  | 35.5 |  |  | 35% - 50% |  | 55.1 |  |  | 47.9 |  |  | 50% - 60%
Hedge funds | 8.5 |  |  | 13.5 |  |  | 0% - 15% |  | — |  |  | — |  |  | 0% - 10%
Cash | 0.9 |  |  | 0.2 |  |  | 0% - 5% |  | 10.1 |  |  | 7.6 |  |  | 0% - 10%
Total | 100.0 | % |  | 100.0 | % |  |  |  | 100.0 | % |  | 100.0 | % |  |
Schedule of Fair Value Hierarchy by Asset Category for Postretirement Benefit Plan Assets [Table Text Block] |
December 31, 2012 |  |  |  |  |  |  |  |
Asset Categories |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  | (in millions)
Cash & Cash Equivalents |  | $ | 18.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 18.5 |
Equity |  |  |  |  |  |  |  |
U.S. Large Cap |  | 104.0 |  |  | — |  |  | — |  |  | 104.0 |
U.S. Small/Mid Cap |  | 46.9 |  |  | — |  |  | — |  |  | 46.9 |
World Equity |  | 111.2 |  |  | — |  |  | — |  |  | 111.2 |
Fixed Income Securities |  |  |  |  |  |  |  |
Government & Agencies |  | 100.4 |  |  | — |  |  | — |  |  | 100.4 |
Corporate Bonds - Investment Grade |  | 204.9 |  |  | — |  |  | — |  |  | 204.9 |
Corporate Bonds - Non-investment Grade |  | 26.4 |  |  | — |  |  | — |  |  | 26.4 |
Emerging Market Debt |  | 20.5 |  |  | — |  |  | — |  |  | 20.5 |
Other |  | 15.0 |  |  | — |  |  | — |  |  | 15.0 |
Hedge Funds |  |  |  |  |  |  |  |
Multi Strategy Hedge Fund |  | — |  |  | — |  |  | 47.6 |  |  | 47.6 |
Total Plan Assets |  | $ | 647.8 |  |  | $ | — |  |  | $ | 47.6 |  |  | $ | 695.4 |
December 31, 2011 |  |  |  |  |  |  |  |
Asset Categories |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  | (in millions)
Cash & Cash Equivalents |  | $ | 8.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 8.0 |
Equity |  |  |  |  |  |  |  |
U.S. Large Cap |  | 88.6 |  |  | — |  |  | — |  |  | 88.6 |
U.S. Small/Mid Cap |  | 43.5 |  |  | — |  |  | — |  |  | 43.5 |
World Equity |  | 65.3 |  |  | 20.6 |  |  | — |  |  | 85.9 |
Fixed Income Securities |  |  |  |  |  |  |  |
Government & Agencies |  | 56.6 |  |  | — |  |  | — |  |  | 56.6 |
Corporate Bonds - Investment Grade |  | 68.5 |  |  | — |  |  | — |  |  | 68.5 |
Corporate Bonds - Non-investment Grade |  | 25.3 |  |  | — |  |  | — |  |  | 25.3 |
Emerging Market Debt |  | 11.8 |  |  | — |  |  | — |  |  | 11.8 |
Other |  | 7.0 |  |  | — |  |  | — |  |  | 7.0 |
Hedge Funds |  |  |  |  |  |  |  |
Multi Strategy Hedge Fund |  | — |  |  | — |  |  | 46.5 |  |  | 46.5 |
Total Plan Assets |  | $ | 374.6 |  |  | $ | 20.6 |  |  | $ | 46.5 |  |  | $ | 441.7 |
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] |
| December 31,
| 2012 |  | 2011
| (in millions)
Beginning balance | $ | 46.5 |  |  | $ | 35.7 |
Actual return on plan assets: |  |  |
Relating to assets still held at the reporting date | 1.1 |  |  | (0.5 | )
Purchases, sales and settlements, net | — |  |  | 11.3 |
Ending balance | $ | 47.6 |  |  | $ | 46.5 |

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- Definition Tabular disclosure of the major categories of plan assets of defined benefit pension plans. This information includes the target allocation of plan assets, as well as the weighted average allocation of each category of assets as a percentage of total plan assets. + References No definition available. + Details
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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + References Reference 1: 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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