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Retirement and Other Postretirement Benefit Plans - Schedule of Pension Assets Measured at Fair Value (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | $ 233.8 | $ 214.3 |
Equity Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 17.2 | 28.2 |
Diversified Growth Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 69.0 | 55.6 |
Fixed Income Gilts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements |  | 19.9 |
Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 94.9 | 4.4 |
Liability Driven Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 48.0 | 29.7 |
Index Linked Gilts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements |  | 73.5 |
Diversified Investment, Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 2.5 | 2.4 |
Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 2.2 | 0.6 |
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 2.2 | 0.6 |
Level 1 | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 2.2 | 0.6 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 134.2 | 206.9 |
Level 2 | Equity Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 17.2 | 28.2 |
Level 2 | Diversified Growth Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 69.0 | 55.6 |
Level 2 | Fixed Income Gilts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements |  | 19.9 |
Level 2 | Liability Driven Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 48.0 | 29.7 |
Level 2 | Index Linked Gilts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements |  | 73.5 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 97.4 | 6.8 | $ 6.2
Actual return on plan assets | 0.3 | 0.4 |
Purchases, sales and settlements | 88.2 | 0.3 |
Currency translation adjustments | 2.1 | (0.1) |
Level 3 | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 94.9 | 4.4 | 4.2
Actual return on plan assets | 0.2 | 0.1 |
Purchases, sales and settlements | 88.4 | 0.2 |
Currency translation adjustments | 1.9 | (0.1) |
Level 3 | Diversified Investment, Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 2.5 | 2.4 | $ 2.0
Actual return on plan assets | 0.1 | 0.3 |
Purchases, sales and settlements | (0.2) | $ 0.1 |
Currency translation adjustments | $ 0.2 |  |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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 asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: 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 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=118255775&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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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