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Retirement Plans and Other Postretirement Benefits - Components of Net Periodic Cost, Changes in Plan Assets and Benefit Obligations, and AOCI Impacts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan |  |  |
Service cost: |  |  |
Benefit accrual | $ 0.0 | $ 0.0 | $ 0.0
Other expenses | 0.6 | 0.7 | 0.7
Interest cost | 0.5 | 0.7 | 1.0
Expected return on plan assets | (0.9) | (1.0) | (1.3)
Settlement loss | 0.0 | 0.5 | 0.0
Amortization of: |  |  |
Prior service cost | 0.0 | 0.0 | 0.0
Actuarial loss | 0.4 | 0.3 | 0.3
Net periodic pension expense | 0.6 | 1.2 | 0.7
Changes in plan assets and benefit obligations included in other comprehensive income (loss): |  |  |
Prior service cost | 0.0 | 0.0 | 0.0
Net actuarial loss (gain) | (0.2) | 0.3 | (1.8)
Amortization of: |  |  |
Prior service cost | 0.0 | 0.0 | 0.0
Actuarial loss | (0.4) | (0.8) | (0.3)
Total recognized in other comprehensive income (loss) | $ (0.6) | $ (0.5) | $ (2.1)
Weighted average assumptions used to determine expense: |  |  |
Discount rate | 2.08% | 3.10% | 4.20%
Expected return on plan assets | 4.74% | 4.80% | 5.75%
Weighted average assumptions used to determine benefit obligations as of December 31: |  |  |
Discount rate | 2.57% | 2.08% | 3.10%
Expected return on plan assets | 4.74% | 4.80% | 5.75%
Supplemental Defined Benefit Plans |  |  |
Service cost: |  |  |
Benefit accrual | $ 0.0 | $ 0.0 | $ 0.0
Other expenses | 0.0 | 0.0 | 0.0
Interest cost | 0.3 | 0.5 | 0.6
Expected return on plan assets | 0.0 | 0.0 | 0.0
Settlement loss | 0.0 | 0.0 | 0.0
Amortization of: |  |  |
Prior service cost | 0.0 | 0.0 | 0.0
Actuarial loss | 0.4 | 0.3 | 0.3
Net periodic pension expense | 0.7 | 0.8 | 0.9
Changes in plan assets and benefit obligations included in other comprehensive income (loss): |  |  |
Prior service cost | 0.0 | 0.0 | 0.0
Net actuarial loss (gain) | (0.2) | 1.3 | 0.5
Amortization of: |  |  |
Prior service cost | 0.0 | 0.0 | 0.0
Actuarial loss | (0.4) | (0.3) | (0.2)
Total recognized in other comprehensive income (loss) | $ (0.6) | $ 1.0 | $ 0.3
Weighted average assumptions used to determine expense: |  |  |
Discount rate | 2.08% | 3.10% | 4.20%
Weighted average assumptions used to determine benefit obligations as of December 31: |  |  |
Discount rate | 2.57% | 2.08% | 3.10%

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + 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 (h)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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