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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]  
Schedule of supplemental cash flow information
(in millions)
 
2017
 
2016
 
2015
Cash (paid) for interest, net of amount capitalized
 
$
(413.7
)
 
$
(411.9
)
 
$
(329.6
)
Cash received (paid) for income taxes, net
 
5.2

 
39.7

 
(9.3
)
Significant non-cash transactions:
 
 
 
 
 
 
Accounts payable related to construction costs
 
169.2

 
170.1

 
177.1

Increase (decrease) in restricted cash from the sale (purchase) of investments held in the rabbi trust
 
4.6

 
(59.2
)
 
(60.2
)
Portion of Bostco real estate holdings sale financed with note receivable (1)
 
7.0

 
—

 
—

Amortization of deferred revenue
 
24.9

 
24.7

 
39.9

Note receivable received related to the sale of AMP Trillium LLC (2)
 
—

 
—

 
12.0

Capital assets received related to the sale of AMP Trillium LLC (2)
 
—

 
—

 
6.3


(1) 
See Note 3, Dispositions, for more information on this sale.

(2) 
ITF owned a 30% interest in AMP Trillium LLC. See Note 3, Dispositions, for more information on the sale of ITF.