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Contingencies, Guarantees, Indemnifications and Leases - Leases (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Assets |  |  |
Operating lease assets | $ 176.7 | $ 194.7 |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization | Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization |
Finance lease assets | $ 73.9 | $ 82.4 |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization | Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization |
Total lease assets | $ 250.6 | $ 277.1 |
Liabilities |  |  |
Operating lease liabilities | $ 175.6 | $ 196.5 |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | Other Liabilities. | Other Liabilities. |
Finance lease liabilities | $ 74.8 | $ 83.0 |
Finance Lease, Liability, Statement of Financial Position [Extensible List] | Other Liabilities. | Other Liabilities. |
Total lease liabilities | $ 250.4 | $ 279.5 |
Finance lease cost: |  |  |
Amortization of right-of-use assets | 32.9 | 34.0 | $ 30.5
Interest on lease liabilities | 1.9 | 1.2 | 1.0
Operating lease cost | 56.1 | 61.6 | 66.6
Other lease cost | 9.5 | 12.4 | 10.8
Sublease income | (0.3) | (1.5) | (1.7)
Total lease cost | 100.1 | 107.7 | 107.2
Payments for operating leases | 60.1 | 58.3 | 63.0
Payments for finance leases | 34.3 | 35.1 | $ 31.4
Operating leases, payments due for the twelve months ending December 31: |  |  |
2024 | 46.9 |  |
2025 | 41.1 |  |
2026 | 36.2 |  |
2027 | 30.4 |  |
2028 | 15.9 |  |
2029 and thereafter | 26.3 |  |
Total lease payments | 196.8 |  |
Less: interest | 21.2 |  |
Present value of lease liabilities | 175.6 | 196.5 |
Finance leases, payments due for the twelve months ending December 31: |  |  |
2024 | 31.1 |  |
2025 | 23.4 |  |
2026 | 17.1 |  |
2027 | 7.5 |  |
2028 | 0.1 |  |
Total lease payments | 79.2 |  |
Less: interest | 4.4 |  |
Present value of lease liabilities | 74.8 | 83.0 |
Total leases, payments due for the twelve months ending December 31: |  |  |
2024 | 78.0 |  |
2025 | 64.5 |  |
2026 | 53.3 |  |
2027 | 37.9 |  |
2028 | 16.0 |  |
2029 and thereafter | 26.3 |  |
Total lease payments | 276.0 |  |
Less: interest | 25.6 |  |
Present value of lease liabilities | $ 250.4 | $ 279.5 |
Weighted-average remaining lease term and weighted-average discount rates |  |  |
Weighted average remaining lease term, Operating leases | 6 years | 6 years 4 months 24 days | 6 years 6 months
Weighted average remaining lease term, Finance leases | 3 years | 2 years 9 months 18 days | 3 years 2 months 12 days
Weighted-average discount rate, Operating leases | 3.60% | 3.60% | 3.40%
Weighted-average discount rate, Finance leases | 3.50% | 1.70% | 1.00%

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Indicates line item in statement of financial position that includes operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-2 + Details
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Indicates line item in statement of financial position that includes operating lease right-of-use asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-2 + Details
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- Definition Weighted average discount rate for operating lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of sublease income excluding finance and operating lease expense. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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