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Revenue from Contract with Customers - Contract with Client (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jan. 01, 2018
Revenue from Contract with Customer [Abstract]    
Contract assets with customer $ 124.1 $ 115.6
Contract liability with customer 9.5 $ 9.0
Increase in contract liability from freight billing 8.8  
Revenue from contract liability $ 8.3