Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Supplemental Cash Flow Information (Textuals)
Cash paid for interest, net of amount capitalized	$ 151.0	$ 143.4
Cash paid for income taxes, net of refunds	2.0	22.0
Accounts payable related to construction costs	179.1	4.9
Amortization of deferred revenue	30.3	$ 41.7
Restricted Cash and Cash Equivalents, Noncurrent	$ 108.7