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Employee Benefit Plans - Defined Benefit Pension Plans (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) $ / item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Employee benefit plans |  |  |
Fair value of plan assets | $ 478.1 | $ 441.7 |
Fixed income common trust funds |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 315.4 | 255.6 |
Commingled global fund allocation |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 81.7 | 110.3 |
Global equity common trust funds |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 32.1 | 30.1 |
U.S. Government securities |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 25.2 | 24.5 |
Non-U.S. Government securities |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 0.3 | 13.2 |
Short-term investments |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | $ 22.5 | 7.1 |
Value of short-term investments (in dollars per unit) | $ / item | 1.00 |  |
Other |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | $ 0.9 | 0.9 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 22.5 | 7.1 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income common trust funds |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commingled global fund allocation |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Global equity common trust funds |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government securities |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S. Government securities |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 22.5 | 7.1 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Observable Inputs (Level 2) |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 454.7 | 433.7 |
Significant Observable Inputs (Level 2) | Fixed income common trust funds |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 315.4 | 255.6 |
Significant Observable Inputs (Level 2) | Commingled global fund allocation |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 81.7 | 110.3 |
Significant Observable Inputs (Level 2) | Global equity common trust funds |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 32.1 | 30.1 |
Significant Observable Inputs (Level 2) | U.S. Government securities |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 25.2 | 24.5 |
Significant Observable Inputs (Level 2) | Non-U.S. Government securities |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 0.3 | 13.2 |
Significant Observable Inputs (Level 2) | Short-term investments |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Observable Inputs (Level 2) | Other |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 0.9 | 0.9 |
Significant Unobservable Inputs (Level 3) | Fixed income common trust funds |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Commingled global fund allocation |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Global equity common trust funds |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | U.S. Government securities |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Non-U.S. Government securities |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Short-term investments |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Other |  |  |
Employee benefit plans |  |  |
Fair value of plan assets | $ 0.9 | $ 0.9 |
United States |  |  |
Employee benefit plans |  |  |
Actual Allocations | 100.00% | 100.00% |
Mid-point of Target Allocation Range | 100.00% |  |
Fair value of plan assets | $ 279.8 | $ 263.6 | $ 238.0
Actual return on plan assets | $ 35.1 | $ 35.7 |
United States | Fixed income common trust funds |  |  |
Employee benefit plans |  |  |
Actual Allocations | 68.00% | 67.00% |
Mid-point of Target Allocation Range | 65.00% |  |
United States | Commingled global fund allocation |  |  |
Employee benefit plans |  |  |
Actual Allocations | 11.00% | 17.00% |
Mid-point of Target Allocation Range | 18.00% |  |
United States | Global equity common trust funds |  |  |
Employee benefit plans |  |  |
Actual Allocations | 5.00% | 5.00% |
Mid-point of Target Allocation Range | 5.00% |  |
United States | U.S. Government securities |  |  |
Employee benefit plans |  |  |
Actual Allocations | 9.00% | 9.00% |
Mid-point of Target Allocation Range | 10.00% |  |
United States | Short-term investments |  |  |
Employee benefit plans |  |  |
Actual Allocations | 7.00% | 2.00% |
Mid-point of Target Allocation Range | 2.00% |  |
Foreign Plan |  |  |
Employee benefit plans |  |  |
Actual Allocations | 100.00% | 100.00% |
Mid-point of Target Allocation Range | 100.00% |  |
Fair value of plan assets | $ 198.3 | $ 178.1 | $ 159.2
Actual return on plan assets | $ 19.9 | $ 19.4 |
Foreign Plan | Fixed income common trust funds |  |  |
Employee benefit plans |  |  |
Actual Allocations | 65.00% | 45.00% |
Mid-point of Target Allocation Range | 66.00% |  |
Foreign Plan | Commingled global fund allocation |  |  |
Employee benefit plans |  |  |
Actual Allocations | 25.00% | 37.00% |
Mid-point of Target Allocation Range | 25.00% |  |
Foreign Plan | Global equity common trust funds |  |  |
Employee benefit plans |  |  |
Actual Allocations | 9.00% | 10.00% |
Mid-point of Target Allocation Range | 9.00% |  |
Foreign Plan | Non-U.S. Government securities |  |  |
Employee benefit plans |  |  |
Actual Allocations | 0.00% | 7.00% |
Mid-point of Target Allocation Range | 0.00% |  |
Foreign Plan | Short-term investments |  |  |
Employee benefit plans |  |  |
Actual Allocations | 1.00% | 1.00% |
Mid-point of Target Allocation Range | 0.00% |  |

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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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