Long-term Debt and Other Financing (Details2) - Revolving Credit Facility [Member] - USD ($)	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,500,000,000.0
Line of Credit Facility, Expiration Date	Mar. 31, 2019
Minimum amount of borrowing capacity for a fixed charge coverage ratio applies	$ 150,000,000
Line of Credit Facility, Current Borrowing Capacity	1,181,300,000.0
Outstanding borrowings on revolving credit facility	520,000,000	$ 550,000,000
Letters of credit, outstanding	72,900,000
Line of credit facility, remaining borrowing capacity	$ 588,400,000