Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2016

Supplemental Cash Flow Information [Abstract]

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

(in millions)	2016			2015			2014
Cash (paid) for interest, net of amount capitalized	$	(411.9	)	$	(329.6	)	$	(241.4	)
Cash received (paid) for income taxes, net	39.7			(9.3		)	(22.0		)
Significant non-cash transactions:
Accounts payable related to construction costs	170.1			177.1			1.8
Restricted cash used to purchase investments held in the rabbi trust	59.2			60.2			—
Amortization of deferred revenue	24.7			39.9			55.7
Note receivable received related to the sale of AMP Trillium*	—			12.0			—
Capital assets received related to the sale of AMP Trillium *	—			6.3			—

* ITF owned a 30% interest in AMP. See Note 3, Dispositions, for more information on the sale of ITF.