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Supplemental Cash Flow Information
 12 Months Ended
Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]  
SUPPLEMENTAL CASH FLOW INFORMATION
SUPPLEMENTAL CASH FLOW INFORMATION
(in millions)
 
2015
 
2014
 
2013
Cash paid for interest, net of amount capitalized
 
$
329.6

 
$
241.1

 
$
250.4

Cash paid (received) for income taxes, net of refunds
 
9.3

 
22.0

 
(39.6
)
 
 
 
 
 
 
 
Significant non-cash transactions:
 
 
 
 
 
 
Construction costs funded through accounts payable
 
177.1

 
1.8

 
4.7

Amortization of deferred revenue
 
39.9

 
55.7

 
56.5

Note receivable received related to the sale of AMP Trillium*
 
12.0

 
—

 
—

Capital assets received related to the sale of AMP Trillium *
 
6.3

 
—

 
—


*  
See Note 3, Dispositions, for more information.

At December 31, 2015, restricted cash of $118.4 million was recorded within other long-term assets on our balance sheet. This amount was held in the Integrys rabbi trust and represents a portion of the required funding that was triggered by the announcement of the Integrys acquisition.