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Accounts Receivable - Allowance for Doubtful Accounts Activity (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Activity Related to our Allowance for Doubtful Accounts      
Balance at Beginning of Period $ 103.4 $ 71.6 $ 43.0
Additions and Charges to Expense 52.4 61.2 47.2
Deductions and Accounts Written Off (42.7) (29.4) (18.6)
Balance at End of Period $ 113.1 $ 103.4 $ 71.6