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Retirement and Deferred Compensation Plans - Schedule of Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Loss (Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net Periodic Benefit Cost |  |  |  |
Settlements | $ 10.2 |  |  |
Pension Plan |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost |  | $ 21.0 | $ 15.1 | $ 10.9
Interest cost |  | 9.4 | 12.7 | 11.6
Expected return on assets |  | (13.5) | (12.9) | (10.6)
Settlements |  | 13.8 | 0.4 |
Net loss |  | 2.7 | 1.2 | 1.4
Prior service cost |  | 0.7 | 0.7 | 0.6
Net periodic benefit cost |  | 34.1 | 17.2 | 13.9
Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income/Loss |  |  |  |
Net loss (gain) |  | 44.1 | 45.5 | (16.6)
Prior service cost |  | 0.4 | 1.0 | 1.4
Amortization of net loss |  | (6.3) | (1.6) | (1.4)
Amortization of prior service cost |  | (0.7) | (0.7) | (0.6)
Total recognized in other comprehensive income/loss |  | 37.5 | 44.2 | (17.2)
Total recognized in net periodic benefit cost and other comprehensive income/loss |  | 71.6 | 61.4 | (3.3)
Retiree health care plan |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Interest cost |  | 0.4 | 0.5 | 0.5
Net loss |  | 0.1 |  | 0.1
Prior service cost |  | (0.8) | (0.8) | (0.8)
Net periodic benefit cost |  | (0.3) | (0.3) | (0.2)
Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income/Loss |  |  |  |
Net loss (gain) |  | 1.1 | 0.8 | (0.5)
Amortization of net loss |  | (0.1) |  | (0.1)
Amortization of prior service cost |  | 0.8 | 0.8 | 0.8
Total recognized in other comprehensive income/loss |  | 1.8 | 1.6 | $ 0.2
Total recognized in net periodic benefit cost and other comprehensive income/loss |  | $ 1.5 | $ 1.3 |

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- Definition Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss. + 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 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 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=118257860&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=118257860&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 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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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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