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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases, Operating [Abstract]      
2018 $ 154.5    
2019 145.5    
2020 123.9    
2021 100.4    
2022 88.2    
Thereafter 286.0    
Total minimum payments required 898.5    
Lease expense $ 204.6 $ 207.5 $ 212.9