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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Defined Benefit Plan, Assumptions [Table Text Block] |
| Pension Benefits |  | OPEB
| 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
| U.S. |  | U.K. |  | U.S. |  | U.K. |  | U.S. |  | U.K. |  |  |  |  |  |
Discount rate | 2.50 | % |  | 1.55 | % |  | 3.40 | % |  | 2.05 | % |  | 4.30 | % |  | 2.95 | % |  | 2.55 | % |  | 3.35 | % |  | 4.35 | %
Expected return on plan assets | 7.25 | % |  | 4.00 | % |  | 7.25 | % |  | 4.00 | % |  | 7.50 | % |  | 5.10 | % |  | N/A |  | N/A |  | N/A
Rate of compensation increase | N/A |  | 3.15 | % |  | N/A |  | 3.15 | % |  | 4.00 | % |  | 3.40 | % |  | 4.00 | % |  | 4.00 | % |  | 4.00 | %
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] | The following table summarizes the changes in projected benefit obligations and plan assets and reconciles the funded status of the benefit plans, which is the net benefit plan liability:
| Pension Benefits |  | OPEB
| December 31, |  | December 31,
| 2020 |  | 2019 |  | 2020 |  | 2019
| (in millions)
Change in benefit obligation |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ | 740.2 |  |  | $ | 734.5 |  |  | $ | 549.1 |  |  | $ | 537.3 |
Service cost | 2.0 |  |  | 1.5 |  |  | 0.4 |  |  | 0.3 |
Interest cost | 21.4 |  |  | 28.0 |  |  | 10.2 |  |  | 12.8 |
Actuarial loss | 63.5 |  |  | 71.5 |  |  | 25.3 |  |  | 11.9 |
Change in GM portion of OPEB obligation | — |  |  | — |  |  | 14.0 |  |  | 3.1 |
Participant contributions | 0.2 |  |  | 0.2 |  |  | — |  |  | — |
Curtailments | — |  |  | (1.9) |  |  | — |  |  | — |
Settlements | (3.3) |  |  | (28.8) |  |  | — |  |  | — |
Benefit payments | (34.4) |  |  | (44.1) |  |  | (12.5) |  |  | (15.5) |
Sale of business | — |  |  | (26.2) |  |  | — |  |  | (0.8) |
Currency fluctuations | 8.7 |  |  | 5.5 |  |  | — |  |  | — |
Other | 0.6 |  |  | — |  |  | — |  |  | — |
Net change | 58.7 |  |  | 5.7 |  |  | 37.4 |  |  | 11.8 |
Benefit obligation at end of year | $ | 798.9 |  |  | $ | 740.2 |  |  | $ | 586.5 |  |  | $ | 549.1 |
Change in plan assets |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 636.6 |  |  | $ | 625.8 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets | 55.7 |  |  | 87.5 |  |  | — |  |  | — |
Employer contributions | 8.5 |  |  | 10.0 |  |  | 12.5 |  |  | 15.5 |
Participant contributions | 0.2 |  |  | 0.2 |  |  | — |  |  | — |
Benefit payments | (34.4) |  |  | (44.1) |  |  | (12.5) |  |  | (15.5) |
Settlements | (3.3) |  |  | (28.8) |  |  | — |  |  | — |
Sale of business | — |  |  | (20.7) |  |  | — |  |  | — |
Currency fluctuations | 6.6 |  |  | 6.7 |  |  | — |  |  | — |
Net change | 33.3 |  |  | 10.8 |  |  | — |  |  | — |
Fair value of plan assets at end of year | $ | 669.9 |  |  | $ | 636.6 |  |  | $ | — |  |  | $ | — |
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] | Amounts recognized in our Consolidated Balance Sheets are as follows:
| Pension Benefits |  | OPEB
| December 31, |  | December 31,
| 2020 |  | 2019 |  | 2020 |  | 2019
| (in millions)
Noncurrent assets | $ | 20.2 |  |  | $ | 21.2 |  |  | $ | — |  |  | $ | — |
Current liabilities | (8.0) |  |  | (6.6) |  |  | (29.8) |  |  | (29.1) |
Noncurrent liabilities | (141.2) |  |  | (118.2) |  |  | (556.7) |  |  | (520.0) |
Net liability | $ | (129.0) |  |  | $ | (103.6) |  |  | $ | (586.5) |  |  | $ | (549.1) |
Schedule of Pre-tax Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] | Pre-tax amounts recorded in accumulated other comprehensive income (loss) (AOCI), not yet recognized in net periodic benefit cost (credit) as of December 31, 2020 and 2019, consists of:
| Pension Benefits |  | OPEB
| December 31, |  | December 31,
| 2020 |  | 2019 |  | 2020 |  | 2019
| (in millions)
Net actuarial gain (loss) | $ | (278.0) |  |  | $ | (239.2) |  |  | $ | (4.9) |  |  | $ | 19.3 |
Net prior service credit (cost) | (1.8) |  |  | (1.2) |  |  | 3.1 |  |  | 4.7 |
Total amounts recorded | $ | (279.8) |  |  | $ | (240.4) |  |  | $ | (1.8) |  |  | $ | 24.0 |
Schedule of Net Benefit Costs [Table Text Block] | The components of net periodic benefit cost (credit) are as follows:
| Pension Benefits |  | OPEB
| 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
| (in millions)
Service cost | $ | 2.0 |  |  | $ | 1.5 |  |  | $ | 2.6 |  |  | $ | 0.4 |  |  | $ | 0.3 |  |  | $ | 0.4 |
Interest cost | 21.4 |  |  | 28.0 |  |  | 27.3 |  |  | 10.2 |  |  | 12.8 |  |  | 12.4 |
Expected asset return | (38.4) |  |  | (41.1) |  |  | (45.8) |  |  | — |  |  | — |  |  | — |
Amortized actuarial loss | 8.6 |  |  | 6.4 |  |  | 7.8 |  |  | 1.0 |  |  | 0.1 |  |  | 0.8 |
Amortized prior service cost (credit) | 0.1 |  |  | — |  |  | 0.1 |  |  | (1.5) |  |  | (1.5) |  |  | (2.7) |
Curtailment loss (gain) | — |  |  | — |  |  | 3.2 |  |  | — |  |  | — |  |  | (0.6) |
Settlement charge | 0.5 |  |  | 10.4 |  |  | 0.4 |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost (credit) | $ | (5.8) |  |  | $ | 5.2 |  |  | $ | (4.4) |  |  | $ | 10.1 |  |  | $ | 11.7 |  |  | $ | 10.3 |
Schedule of Allocation of Plan Assets [Table Text Block] |
| U.S. |  | U.K. |
|  |  | Target |  |  |  | Target |
| 2020 |  | 2019 |  | Allocation |  | 2020 |  | 2019 |  | Allocation |
Equity securities | 34.7 | % |  | 35.2 | % |  | 25% - 40% |  | 21.8 | % |  | 22.7 | % |  | 15% - 30% |
Fixed income securities | 57.3 |  |  | 52.9 |  |  | 50% - 70% |  | 65.9 |  |  | 66.8 |  |  | 60% - 80% |
Alternative assets | 7.3 |  |  | 10.4 |  |  | 5% - 15% |  | 8.9 |  |  | 9.4 |  |  | 5% - 15% |
Cash | 0.7 |  |  | 1.5 |  |  | 0% - 5% |  | 3.4 |  |  | 1.1 |  |  | 0% - 5% |
Total | 100.0 | % |  | 100.0 | % |  |  |  | 100.0 | % |  | 100.0 | % |  |  |
The primary objective of our pension plan assets is to provide a source of retirement income for participants and beneficiaries. Our primary financial objectives for the pension plan assets have been established in conjunction with a comprehensive review of our current and projected financial requirements. These objectives include having the ability to pay all future benefits and expenses when due, maintaining flexibility and minimizing volatility. These objectives are based on a long-term investment horizon. Defined Benefit Pension Plan Assets Investments in our defined benefit plans are stated at fair value. Level 1 assets are valued using quoted market prices that represent the asset value of the shares held by the trusts. The level 2 assets are investments in pooled funds, which are valued using a model to reflect the valuation of their underlying assets that are publicly traded with observable values. The fair values of our pension plan assets are as follows:
December 31, 2020 |  |  |  |  |  |  |  |
Asset Categories |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  | (in millions)
Cash and Cash Equivalents |  | $ | 7.4 |  |  | $ | 2.9 |  |  | $ | — |  |  | $ | 10.3 |
Equity |  |  |  |  |  |  |  |
U.S. Large Cap |  | 88.1 |  |  | 2.7 |  |  | — |  |  | 90.8 |
U.S. Small/Mid Cap |  | 20.5 |  |  | — |  |  | — |  |  | 20.5 |
World Equity |  | 87.0 |  |  | 7.8 |  |  | — |  |  | 94.8 |
Fixed Income Securities |  |  |  |  |  |  |  |
Government & Agencies |  | 84.1 |  |  | 45.9 |  |  | — |  |  | 130.0 |
Corporate Bonds - Investment Grade |  | 219.0 |  |  | 2.7 |  |  | — |  |  | 221.7 |
Corporate Bonds - Non-investment Grade |  | 22.4 |  |  | 0.7 |  |  | — |  |  | 23.1 |
Emerging Market Debt |  | 21.1 |  |  | 1.1 |  |  | — |  |  | 22.2 |
Other |  | 3.6 |  |  | 0.3 |  |  | — |  |  | 3.9 |
Other |  |  |  |  |  |  |  |
Property Funds (a) |  | — |  |  | — |  |  | — |  |  | 44.2 |
Liquid Alternatives Fund (a) |  | — |  |  | — |  |  | — |  |  | 1.8 |
Structured Credit Fund (a) |  | — |  |  | — |  |  | — |  |  | 6.6 |
Total Plan Assets |  | $ | 553.2 |  |  | $ | 64.1 |  |  | $ | — |  |  | $ | 669.9 |
December 31, 2019 |  |  |  |  |  |  |  |
Asset Categories |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  | (in millions)
Cash and Cash Equivalents |  | $ | 7.3 |  |  | $ | 2.0 |  |  | $ | — |  |  | $ | 9.3 |
Equity |  |  |  |  |  |  |  |
U.S. Large Cap |  | 82.4 |  |  | 3.0 |  |  | — |  |  | 85.4 |
U.S. Small/Mid Cap |  | 22.7 |  |  | — |  |  | — |  |  | 22.7 |
World Equity |  | 88.1 |  |  | 4.7 |  |  | — |  |  | 92.8 |
Fixed Income Securities |  |  |  |  |  |  |  |
Government & Agencies |  | 74.3 |  |  | 45.0 |  |  | — |  |  | 119.3 |
Corporate Bonds - Investment Grade |  | 185.8 |  |  | 0.6 |  |  | — |  |  | 186.4 |
Corporate Bonds - Non-investment Grade |  | 21.7 |  |  | 1.1 |  |  | — |  |  | 22.8 |
Emerging Market Debt |  | 20.4 |  |  | 0.7 |  |  | — |  |  | 21.1 |
Other |  | 6.9 |  |  | 4.8 |  |  | — |  |  | 11.7 |
Other |  |  |  |  |  |  |  |
Property Funds (a) |  | — |  |  | — |  |  | — |  |  | 57.3 |
Liquid Alternatives Fund (a) |  | — |  |  | — |  |  | — |  |  | 1.6 |
Structured Credit Fund (a) |  | — |  |  | — |  |  | — |  |  | 6.2 |
Total Plan Assets |  | $ | 509.6 |  |  | $ | 61.9 |  |  | $ | — |  |  | $ | 636.6 |
(a) In accordance with ASC 820 - Fair Value Measurement certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the Consolidated Balance Sheets.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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