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Employee Benefit Plans - Summary of Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Benefits |  |  |
Components of Net Periodic Benefit Cost |  |  |
Service cost | $ (0.8) | $ (2.3) | $ (1.8)
Interest cost | (6.5) | (8.0) | (7.4)
Expected return on plan assets | 6.8 | 7.3 | 8.2
Amortization of net loss | (2.5) | (4.1) | (4.2)
Amortization of prior service cost | 0.0 | 0.6 | 0.5
Curtailment gain (loss) | 0.0 | 1.3 | 0.0
Settlement gain (loss) | 0.0 | 0.0 | 0.0
Net periodic benefit cost | (3.0) | (5.2) | (4.7)
Net gain (loss) | (3.8) | 5.2 | (6.5)
Amortization of net loss | 2.5 | 4.1 | 4.2
Prior service cost | (0.1) | 0.0 | 0.0
Amortization of prior service credit | 0.0 | (0.6) | (0.5)
Curtailment gain recognition of prior service credit | 0.0 | (1.3) | 0.0
Recognition of settlement loss | 0.0 | 0.0 | 0.0
Total recognized in Other comprehensive income (loss) | (1.4) | 7.4 | (2.8)
Total recognized in net periodic benefit cost and Other comprehensive income (loss) | (4.4) | 2.2 | (7.5)
Other Post-retirement Benefits |  |  |
Components of Net Periodic Benefit Cost |  |  |
Service cost | (0.1) | (0.1) | (0.1)
Interest cost | (0.3) | (0.4) | (0.4)
Expected return on plan assets | 0.0 | 0.0 | 0.0
Amortization of net loss | 0.1 | 0.1 | (0.3)
Amortization of prior service cost | 0.0 | 0.0 | 0.0
Curtailment gain (loss) | 0.0 | 0.0 | 0.0
Settlement gain (loss) | 0.0 | 0.0 | 0.0
Net periodic benefit cost | (0.3) | (0.4) | (0.8)
Net gain (loss) | (3.7) | 0.3 | 1.4
Amortization of net loss | (0.1) | (0.1) | 0.3
Prior service cost | 0.0 | 0.0 | 0.0
Amortization of prior service credit | 0.0 | 0.0 | 0.0
Curtailment gain recognition of prior service credit | 0.0 | 0.0 | 0.0
Recognition of settlement loss | 0.0 | 0.0 | 0.0
Total recognized in Other comprehensive income (loss) | (3.8) | 0.2 | 1.7
Total recognized in net periodic benefit cost and Other comprehensive income (loss) | (4.1) | (0.2) | 0.9
Other Post-retirement Benefits | Non-qualified Plan Benefits |  |  |
Components of Net Periodic Benefit Cost |  |  |
Service cost | 0.0 | (0.1) | (0.1)
Interest cost | (0.1) | (0.1) | (0.1)
Expected return on plan assets | 0.0 | 0.0 | 0.0
Amortization of net loss | (0.1) | 0.0 | (0.1)
Amortization of prior service cost | 0.0 | 0.1 | 0.2
Curtailment gain (loss) | 0.0 | 0.1 | 0.6
Settlement gain (loss) | 0.0 | 0.0 | (0.1)
Net periodic benefit cost | (0.2) | 0.0 | 0.4
Net gain (loss) | (0.2) | (0.2) | 0.2
Amortization of net loss | 0.1 | 0.0 | 0.1
Prior service cost | 0.0 | 0.0 | 0.0
Amortization of prior service credit | 0.0 | (0.1) | (0.2)
Curtailment gain recognition of prior service credit | 0.0 | (0.1) | (0.6)
Recognition of settlement loss | 0.0 | 0.0 | 0.1
Total recognized in Other comprehensive income (loss) | (0.1) | (0.4) | (0.4)
Total recognized in net periodic benefit cost and Other comprehensive income (loss) | $ (0.3) | $ (0.4) | $ 0.0

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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=118257860&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=118257860&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=118255775&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=109237824&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=118255775&loc=d3e2709-114920 + Details
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