Supplemental Cash Flow Information Significant Non-Cash Investing Activities(Details) - USD ($) $ in Millions		12 Months Ended
	Feb. 13, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Outstanding receivables from outside parties for the funding of capital expenditures		$ 23.0	$ 32.1	$ 33.0
Purchases of property and equipment accrued in accounts payable		$ 26.2	$ 51.3	$ 40.1
Class A Common Stock [Member]
Conversion of shares to Class A Common Stock, shares	5,984,232
Common Stock [Member] | Settlement of the prepaid stock purchase contract component of the TEUs [Member] | Class A Common Stock [Member]
Conversion of shares to Class A Common Stock, shares		3,539,240