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Supplemental Cash Flow Information
 12 Months Ended
Dec. 31, 2016
Supplemental Cash Flow Information [Abstract]  
SUPPLEMENTAL CASH FLOW INFORMATION
SUPPLEMENTAL CASH FLOW INFORMATION
(in millions)
 
2016
 
2015
 
2014
Cash (paid) for interest, net of amount capitalized
 
$
(116.2
)
 
$
(116.2
)
 
$
(117.9
)
Cash received (paid) for income taxes, net
 
100.2

 
(58.5
)
 
(20.8
)
Significant non-cash transactions:
 
 
 
 
 
 
Accounts payable related to construction costs
 
9.1

 
11.7

 
1.7