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Accounts Receivable (Tables)
 9 Months Ended
Sep. 30, 2017
Receivables [Abstract]  
Schedule of accounts receivable
 (amounts in millions)
September 30,
2017
 
December 31,
2016
Total accounts receivable, net
$
1,146.9

 
$
1,058.0

Non-current accounts receivable, net
(13.0
)
 
(3.2
)
Current accounts receivable, net
$
1,133.9

 
$
1,054.8