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Revenue Recognition and Accounts Receivable (Accounts Receivable, Net) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]      
Proceeds from Sale and Collection of Receivables $ 90.1 $ 131.9  
Trade receivables, net   2,440.8 $ 2,640.1
Other receivables   312.4 418.7
Accounts receivable, net   $ 2,753.2 $ 3,058.8