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Contingencies, Guarantees, Indemnifications and Leases - Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets      
Operating lease assets $ 234.9 $ 190.0  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet us-gaap:PropertyPlantAndEquipmentNet  
Finance lease assets $ 49.5 $ 31.4  
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet us-gaap:PropertyPlantAndEquipmentNet  
Total lease assets $ 284.4 $ 221.4  
Liabilities      
Operating lease liabilities $ 231.4 $ 197.5  
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other Liabilities Other Liabilities  
Finance lease liabilities $ 50.1 $ 31.8  
Finance Lease, Liability, Statement of Financial Position [Extensible List] Other Liabilities Other Liabilities  
Total lease liabilities $ 281.5 $ 229.3  
Finance lease cost:      
Amortization of right-of-use assets 20.5 14.6  
Interest on lease liabilities 1.0 1.0  
Operating lease cost 58.7 55.8  
Other lease cost 8.6 8.0  
Sublease income (1.6) (1.7)  
Total lease cost 87.2 77.7  
Operating lease rental expense     $ 36.7
Capital lease depreciation expense     $ 12.9
Payments for operating leases 71.6 56.1  
Payments for finance leases 21.2 15.1  
Operating leases, payments due for the twelve months ending December 31:      
2021 56.9    
2022 49.8    
2023 39.1    
2024 30.5    
2025 22.8    
2026 and thereafter 60.8    
Total lease payments 259.9    
Less: interest 28.5    
Present value of lease liabilities 231.4 197.5  
Finance leases, payments due for the twelve months ending December 31:      
2021 21.5    
2022 13.6    
2023 11.4    
2024 3.6    
2025 1.2    
Total lease payments 51.3    
Less: interest 1.2    
Present value of lease liabilities 50.1 31.8  
Total leases, payments due for the twelve months ending December 31:      
2021 78.4    
2022 63.4    
2023 50.5    
2024 34.1    
2025 24.0    
2026 and thereafter 60.8    
Total lease payments 311.2    
Less: interest 29.7    
Present value of lease liabilities $ 281.5 $ 229.3  
Weighted-average remaining lease term and weighted-average discount rates      
Weighted average remaining lease term, Operating leases 6 years 8 months 12 days 6 years 8 months 12 days  
Weighted average remaining lease term, Finance leases 3 years 2 years 7 months 6 days  
Weighted-average discount rate, Operating leases 3.20% 3.90%  
Weighted-average discount rate, Finance leases 1.80% 2.70%