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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Minimum future lease payments due [Abstract]      
2019 $ 167.8    
2020 153.1    
2021 132.3    
2022 99.4    
2023 81.0    
Thereafter 257.3    
Minimum lease payments 890.9    
Minimum rentals to be received under noncancelable operating subleases 34.9    
Total rent expense including office space and other rentals $ 195.3 $ 197.3 $ 170.4