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Employee Benefit Plans Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Schedule of Assumptions Used [Table Text Block] |
| Pension Benefits |  | OPEB
| 2015 |  | 2014 |  | 2013 |  | 2015 |  | 2014 |  | 2013
| U.S. |  | U.K |  | U.S. |  | U.K |  | U.S. |  | U.K. |  |  |  |  |  |
Discount rate | 4.40 | % |  | 3.90 | % |  | 4.10 | % |  | 3.70 | % |  | 5.00 | % |  | 4.50 | % |  | 4.45 | % |  | 4.15 | % |  | 4.95 | %
Expected return on plan assets | 7.50 | % |  | 5.00 | % |  | 7.50 | % |  | 5.00 | % |  | 7.50 | % |  | 5.15 | % |  | N/A |  |  | N/A |  |  | N/A |
Rate of compensation increase | 4.00 | % |  | 3.30 | % |  | 4.00 | % |  | 3.30 | % |  | 4.00 | % |  | 3.60 | % |  | 4.00 | % |  | 4.00 | % |  | 4.00 | %
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] |
| Pension Benefits |  | OPEB
| December 31, |  | December 31,
| 2015 |  | 2014 |  | 2015 |  | 2014
| (in millions)
Change in benefit obligation |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ | 738.8 |  |  | $ | 755.4 |  |  | $ | 654.7 |  |  | $ | 577.9 |
Service cost | 3.2 |  |  | 3.5 |  |  | 0.4 |  |  | 0.3 |
Interest cost | 28.6 |  |  | 36.1 |  |  | 15.0 |  |  | 15.3 |
Actuarial loss (gain) | (32.1 | ) |  | 119.3 |  |  | (35.9 | ) |  | 41.2 |
Change in GM portion of OPEB obligation | — |  |  | — |  |  | (31.6 | ) |  | 31.8 |
Participant contributions | 0.4 |  |  | 0.4 |  |  | — |  |  | — |
Settlements | — |  |  | (131.1 | ) |  | — |  |  | — |
Benefit payments | (38.4 | ) |  | (36.5 | ) |  | (14.2 | ) |  | (11.8 | )
Currency fluctuations | (7.4 | ) |  | (8.3 | ) |  | — |  |  | — |
Net change | (45.7 | ) |  | (16.6 | ) |  | (66.3 | ) |  | 76.8 |
Benefit obligation at end of year | $ | 693.1 |  |  | $ | 738.8 |  |  | $ | 588.4 |  |  | $ | 654.7 |
Change in plan assets |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 643.7 |  |  | $ | 713.4 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets | (5.0 | ) |  | 77.2 |  |  | — |  |  | — |
Employer contributions | 20.1 |  |  | 1.9 |  |  | 14.2 |  |  | 11.8 |
Participant contributions | 0.4 |  |  | 0.4 |  |  | — |  |  | — |
Benefit payments | (38.4 | ) |  | (36.5 | ) |  | (14.2 | ) |  | (11.8 | )
Settlements | — |  |  | (104.2 | ) |  | — |  |  | — |
Currency fluctuations | (8.0 | ) |  | (8.5 | ) |  | — |  |  | — |
Net change | (30.9 | ) |  | (69.7 | ) |  | — |  |  | — |
Fair value of plan assets at end of year | $ | 612.8 |  |  | $ | 643.7 |  |  | $ | — |  |  | $ | — |
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] |
| Pension Benefits |  | OPEB
| December 31, |  | December 31,
| 2015 |  | 2014 |  | 2015 |  | 2014
| (in millions)
Noncurrent assets | $ | 27.0 |  |  | $ | 6.9 |  |  | $ | — |  |  | $ | — |
Current liabilities | (4.2 | ) |  | (3.0 | ) |  | (29.4 | ) |  | (29.6 | )
Noncurrent liabilities | (103.1 | ) |  | (99.0 | ) |  | (559.0 | ) |  | (625.1 | )
Net liability | $ | (80.3 | ) |  | $ | (95.1 | ) |  | $ | (588.4 | ) |  | $ | (654.7 | )
Schedule of Pre-tax Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
| Pension Benefits |  | OPEB
| December 31, |  | December 31,
| 2015 |  | 2014 |  | 2015 |  | 2014
| (in millions)
Net actuarial gain (loss) | $ | (222.9 | ) |  | $ | (215.3 | ) |  | $ | 1.1 |  |  | $ | (35.7 | )
Net prior service credit | 0.6 |  |  | 0.7 |  |  | 12.7 |  |  | 15.4 |
Total amounts recorded | $ | (222.3 | ) |  | $ | (214.6 | ) |  | $ | 13.8 |  |  | $ | (20.3 | )
Schedule of Net Benefit Costs [Table Text Block] |
| Pension Benefits |  | OPEB
| 2015 |  | 2014 |  | 2013 |  | 2015 |  | 2014 |  | 2013
| (in millions)
Service cost | $ | 3.2 |  |  | $ | 3.5 |  |  | $ | 3.4 |  |  | $ | 0.4 |  |  | $ | 0.3 |  |  | $ | 0.4 |
Interest cost | 28.6 |  |  | 36.1 |  |  | 33.8 |  |  | 15.0 |  |  | 15.3 |  |  | 13.2 |
Expected asset return | (42.0 | ) |  | (48.4 | ) |  | (45.8 | ) |  | — |  |  | — |  |  | — |
Amortized actuarial loss | 6.0 |  |  | 5.4 |  |  | 8.9 |  |  | 0.8 |  |  | 0.5 |  |  | 0.9 |
Amortized prior service cost (credit) | (0.1 | ) |  | (0.1 | ) |  | 5.4 |  |  | (2.7 | ) |  | (2.7 | ) |  | (1.8 | )
Settlement charge | — |  |  | 35.5 |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost (credit) | $ | (4.3 | ) |  | $ | 32.0 |  |  | $ | 5.7 |  |  | $ | 13.5 |  |  | $ | 13.4 |  |  | $ | 12.7 |
Schedule of Allocation of Plan Assets [Table Text Block] | The fair values of our pension plan assets are as follows:
December 31, 2015 |  |  |  |  |  |  |  |
Asset Categories |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  | (in millions)
Cash & Cash Equivalents |  | $ | 23.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 23.7 |
Equity |  |  |  |  |  |  |  |
U.S. Large Cap |  | 77.1 |  |  | — |  |  | — |  |  | 77.1 |
U.S. Small/Mid Cap |  | 28.2 |  |  | — |  |  | — |  |  | 28.2 |
World Equity |  | 95.5 |  |  | — |  |  | — |  |  | 95.5 |
Fixed Income Securities |  |  |  |  |  |  |  |
Government & Agencies |  | 68.1 |  |  | 35.8 |  |  | — |  |  | 103.9 |
Corporate Bonds - Investment Grade |  | 138.4 |  |  | — |  |  | — |  |  | 138.4 |
Corporate Bonds - Non-investment Grade |  | 24.8 |  |  | — |  |  | — |  |  | 24.8 |
Emerging Market Debt |  | 18.1 |  |  | — |  |  | — |  |  | 18.1 |
Other |  | 6.9 |  |  | — |  |  | — |  |  | 6.9 |
Hedge Funds |  |  |  |  |  |  |  |
Property Funds |  | — |  |  | — |  |  | 54.6 |  |  | 54.6 |
Multi Strategy Hedge Fund |  | — |  |  | — |  |  | 41.6 |  |  | 41.6 |
Total Plan Assets |  | $ | 480.8 |  |  | $ | 35.8 |  |  | $ | 96.2 |  |  | $ | 612.8 |
December 31, 2014 |  |  |  |  |  |  |  |
Asset Categories |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  | (in millions)
Cash & Cash Equivalents |  | $ | 6.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 6.7 |
Equity |  |  |  |  |  |  |  |
U.S. Large Cap |  | 87.3 |  |  | — |  |  | — |  |  | 87.3 |
U.S. Small/Mid Cap |  | 25.2 |  |  | — |  |  | — |  |  | 25.2 |
World Equity |  | 94.2 |  |  | — |  |  | — |  |  | 94.2 |
Fixed Income Securities |  |  |  |  |  |  |  |
Government & Agencies |  | 67.9 |  |  | 58.8 |  |  | — |  |  | 126.7 |
Corporate Bonds - Investment Grade |  | 139.9 |  |  | — |  |  | — |  |  | 139.9 |
Corporate Bonds - Non-investment Grade |  | 31.9 |  |  | — |  |  | — |  |  | 31.9 |
Emerging Market Debt |  | 19.0 |  |  | — |  |  | — |  |  | 19.0 |
Other |  | 7.2 |  |  | — |  |  | — |  |  | 7.2 |
Hedge Funds |  |  |  |  |  |  |  |
Property Funds |  | — |  |  | — |  |  | 48.3 |  |  | 48.3 |
Multi Strategy Hedge Fund |  | — |  |  | — |  |  | 57.3 |  |  | 57.3 |
Total Plan Assets |  | $ | 479.3 |  |  | $ | 58.8 |  |  | $ | 105.6 |  |  | $ | 643.7 |
| U.S. |  | U.K.
|  |  | Target |  |  |  | Target
| 2015 |  | 2014 |  | Allocation |  | 2015 |  | 2014 |  | Allocation
Equity securities | 34.8 | % |  | 33.1 | % |  | 30% - 65% |  | 26.7 | % |  | 28.7 | % |  | 25% - 35%
Fixed income securities | 46.2 |  |  | 47.3 |  |  | 35% - 55% |  | 52.0 |  |  | 61.1 |  |  | 55% - 65%
Hedge funds | 17.8 |  |  | 18.3 |  |  | 0% - 20% |  | 9.6 |  |  | 10.1 |  |  | 5% - 15%
Cash | 1.2 |  |  | 1.3 |  |  | 0% - 5% |  | 11.7 |  |  | 0.1 |  |  | 0% - 5%
Total | 100.0 | % |  | 100.0 | % |  |  |  | 100.0 | % |  | 100.0 | % |  |
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] |
| December 31,
| 2015 |  | 2014
| (in millions)
Beginning balance | $ | 105.6 |  |  | $ | 64.5 |
Actual return on plan assets: |  |  |
Relating to assets still held at the reporting date | 3.8 |  |  | 3.3 |
Purchases, sales and settlements, net | (13.2 | ) |  | 37.8 |
Ending balance | $ | 96.2 |  |  | $ | 105.6 |

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- Definition Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans. + 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 (a)(b)(c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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 (d)(5) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + 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=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + 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 (k) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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