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Note 10. Employee Retirement Plans Employee Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2022
Retirement Benefits [Abstract] |
Defined Benefit Plan, Assumptions [Table Text Block] | Actuarial assumptions
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
Assumptions used to determine benefit obligations at the annual measurement date were: |  |  |  |  |
Obligation discount rate (1) | N/A |  | N/A |  | N/A
Assumptions used to determine net periodic benefit costs were: |  |  |  |  |
Obligation discount rate (1) | N/A |  | N/A |  | 2.71 | %
Long-term rate of return on plan assets (1) | N/A |  | N/A |  | 3.90 | %
(1) Not applicable as of December 31, 2022 and 2021 and for the years ended December 31, 2022 and 2021 as all qualified pension plans were settled as of December 31, 2020.
Schedule of Costs of Retirement Plans [Table Text Block] | Components of Net Periodic Benefit Cost and Other Retirement Expenses
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
| (in millions)
Expense Components |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |
Interest | 0.4 |  |  | 0.4 |  |  | 14.8 |
Expected return on plan assets | — |  |  | — |  |  | (20.9) |
Amortization of actuarial loss | 0.3 |  |  | 0.3 |  |  | 6.0 |
Amortization of prior service cost | — |  |  | — |  |  | 1.2 |
Settlement loss | — |  |  | — |  |  | 151.5 |
Net periodic benefit cost | 0.7 |  |  | 0.7 |  |  | 152.6 |
Defined contribution expense | 9.1 |  |  | 8.6 |  |  | 7.5 |
Net expense | $ | 9.8 |  |  | $ | 9.3 |  |  | $ | 160.1 |
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] | Obligations and funded statusAt December 31, 2022 and 2021, the projected benefit obligations and net funded status of our Supplemental Executive Retirement Plan ("SERP") were $11.2 million and $14.5 million, respectively, which are included in accrued liabilities in our Consolidated Balance Sheets.
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] | Amounts recognized in other comprehensive income (loss)
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
| (in millions)
Settlement of pension plan | $ | — |  |  | $ | — |  |  | $ | 151.5 |
Actuarial gain (loss) | 2.6 |  |  | 0.4 |  |  | 10.4 |
Amortization of actuarial loss | 0.3 |  |  | 0.3 |  |  | 6.0 |
Amortization of prior service cost | — |  |  | — |  |  | 1.2 |
Total before income taxes | 2.9 |  |  | 0.7 |  |  | 169.1 |
Income tax (benefit) expense | 0.6 |  |  | 0.2 |  |  | 39.2 |
Net amount recognized in other comprehensive income (loss) | $ | 2.3 |  |  | $ | 0.5 |  |  | $ | 129.9 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(b)(c) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + 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 (i) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + 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 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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