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Revenue Contract Balances with Customers (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Jan. 01, 2018
Contract Balances with Customers [Abstract]    
Contract with Customer, Asset, Net $ 55.0 $ 51.0
Increase (Decrease) in Accounts Receivable (52.0)  
Contract with Customer, Asset, Reclassified to Receivable 4.0  
Receivables from Customers 393.0 445.0
Contract with Customer, Liability 1.0 $ 1.0
Contract with Customer, Liability, Revenue Recognized $ 0.1