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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Leases          
Operating lease cost $ 20.9 $ 21.2 $ 62.8 $ 61.6  
Cash payments for operating leases (nine months ended)     62.6    
Right-of-use assets obtained in exchange for lease obligations (nine months ended)     $ 53.2    
Weighted average remaining lease term - operating leases 5 years 9 months 18 days   5 years 9 months 18 days    
Weighted average discount rate - operating leases 4.40%   4.40%    
Maturities of operating lease liabilities          
2019 (remaining three months) $ 15.8   $ 15.8    
2020 56.0   56.0    
2021 44.4   44.4    
2022 32.5   32.5    
2023 24.6   24.6    
Thereafter 58.0   58.0    
Total operating lease payments 231.3   231.3    
Less: imputed interest (31.4)   (31.4)    
Total operating lease liabilities $ 199.9   $ 199.9    
Maturities of non-cancellable operating leases under ASC 840.          
2019         $ 59.5
2020         45.5
2021         32.9
2022         22.7
2023         16.2
Thereafter         40.7
Total operating lease payments         $ 217.5