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Contingencies, Guarantees and Indemnifications - Operating and Capital Lease Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating leases      
Operating lease rental expense $ 44.0 $ 40.4 $ 38.0
Operating lease obligations      
Year 1: Operating lease obligations 47.5    
Year 2: Operating lease obligations 38.1    
Year 3: Operating lease obligations 30.3    
Year 4: Operating lease obligations 23.0    
Year 5: Operating lease obligations 18.2    
Year 6 and thereafter: Operating lease obligations 33.5    
Total operating lease obligations 190.6    
Less: Future sublease rental income on noncancelable leases 7.3    
Total future minimum lease payments 183.3    
Capital leases      
Capital lease gross asset balance 60.8 61.3  
Capital lease accumulated depreciation 32.8 29.9  
Capital lease depreciation expense 13.4 $ 14.8 $ 14.1
Capital lease future minimum lease payments      
Year 1: Capital lease future minimum lease payments 11.5    
Year 2: Capital lease future minimum lease payments 9.5    
Year 3: Capital lease future minimum lease payments 3.6    
Year 4: Capital lease future minimum lease payments 0.8    
Year 5: Capital lease future minimum lease payments 0.2    
Year 6 and thereafter: Capital lease future minimum lease payments 0.2    
Total capital lease future minimum lease payments 25.8    
Less: Amounts representing interest 0.9    
Net present value of minimum lease payments $ 24.9