Fair Value Measurements (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
ARO Trust investments	$ 93,100,000	$ 66,700,000
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	0		$ 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	0		0
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount	0		0
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount	0		$ 0
Fair Value, Inputs, Level 1 [Member]
Additional Fair Value Elements [Abstract]
Notes receivable, Fair Value Disclosure	0	0
Long-term debt	0	0
Fair Value, Inputs, Level 2 [Member]
Additional Fair Value Elements [Abstract]
Notes receivable, Fair Value Disclosure	0	1,100,000
Long-term debt	(2,597,600,000)	(1,244,100,000)
Fair Value, Inputs, Level 3 [Member]
Additional Fair Value Elements [Abstract]
Notes receivable, Fair Value Disclosure	0	0
Long-term debt	0	0
Reported Value Measurement [Member]
Additional Fair Value Elements [Abstract]
Notes receivable, Fair Value Disclosure	0	1,100,000
Long-term debt	(2,210,600,000)	(1,419,600,000)
Estimate of Fair Value Measurement [Member]
Additional Fair Value Elements [Abstract]
Notes receivable, Fair Value Disclosure	0	1,100,000
Long-term debt	(2,597,600,000)	(1,244,100,000)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
ARO Trust investments	93,100,000	66,700,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
ARO Trust investments	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
ARO Trust investments	0	0
Fair Value, Measurements, Recurring [Member] | Reported Value Measurement [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
ARO Trust investments	93,100,000	66,700,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
ARO Trust investments	$ 93,100,000	$ 66,700,000