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Assets and Liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]    
Receivables from contracts with customers, net of allowances $ 2,369.7 $ 2,150.2
Increase (decrease) in receivables 219.5  
Contract liabilities: Advance payments from customers 458.4 $ 380.6
Increase (decrease) in liabilities $ 77.8