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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%