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Revenue Recognition - Assets and Liabilities (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Receivables from contracts with customers, net of allowances $ 2,466.8 $ 2,228.3
Increase (decrease) in receivables 238.5  
Contract liabilities: Advance payments from customers 68.9 $ 458.4
Increase (decrease) in liabilities $ (389.5)