Consolidated Statements of Changes in Stockholders' Equity - USD ($)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Beginning balance (shares) at Dec. 31, 2012		59,619,548				0
Beginning balance at Dec. 31, 2012	$ 1,078,000,000	$ 600,000	$ 366,900,000	$ 400,000	$ 531,400,000	$ 0	$ 178,700,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	135,700,000	0	0	0	117,700,000	0	18,000,000
Unrealized loss on cash flow hedges, net of deferred income tax benefit of $14.7 million, $4.0 million and $2.9 million for the years ended December 31, 2015, 2014 and 2013, respectively, and ineffectiveness loss (gain)of $21.6 million, $6.3 million and $(2.5) million for the years ended December 31, 2015, 2014 and 2013, respectively.	(4,400,000)		0	(4,400,000)	0	0	0
Foreign currency translation loss	0
Common stock dividends ($0.45, $1.00 and $0.95 per share, for the years ended December 31, 2015, 2014 and 2013, respectively)	(57,300,000)	$ 0	0	0	(57,300,000)	0	0
Equity-based compensation expense	15,000,000		13,100,000	0	0	$ 0	1,900,000
Distribution to non-controlling interest	(13,200,000)						(13,200,000)
Purchase of common stock (shares)						(1,000,000)
Purchase of common stock	(37,900,000)					$ (37,900,000)
Income tax benefit of equity-based compensation expense	5,900,000		5,900,000	0	0		0
Taxes paid due to the net settlement of equity-based compensation	$ (2,500,000)		(2,500,000)	0	0	$ 0	0
Exercise of equity-based awards (shares)	609,559	609,559
Ending balance (shares) at Dec. 31, 2013		60,229,107				1,000,000
Ending balance at Dec. 31, 2013	$ 1,120,400,000	$ 600,000	384,500,000	(4,000,000)	591,800,000	$ (37,900,000)	185,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options	1,100,000	0	1,100,000	0	0		0
Net income	226,000,000	0	0	0	198,600,000	0	27,400,000
Unrealized loss on cash flow hedges, net of deferred income tax benefit of $14.7 million, $4.0 million and $2.9 million for the years ended December 31, 2015, 2014 and 2013, respectively, and ineffectiveness loss (gain)of $21.6 million, $6.3 million and $(2.5) million for the years ended December 31, 2015, 2014 and 2013, respectively.	(8,300,000)	0	0	(8,300,000)	0	0	0
Foreign currency translation loss	(300,000)			(300,000)
Common stock dividends ($0.45, $1.00 and $0.95 per share, for the years ended December 31, 2015, 2014 and 2013, respectively)	(59,200,000)	$ 0	0	0	(59,200,000)	0	0
Equity-based compensation expense	13,900,000		12,900,000	0	0	$ 0	1,000,000
Distribution to non-controlling interest	(17,100,000)		0	0	0		(17,100,000)
Purchase of common stock (shares)						(2,365,561)
Purchase of common stock	(74,700,000)		0	0	0	$ (74,700,000)	0
Income tax benefit of equity-based compensation expense	1,800,000		1,800,000	0	0	0	0
Taxes paid due to the net settlement of equity-based compensation	$ (5,200,000)		(5,200,000)	0	0	$ 0	0
Exercise of equity-based awards (shares)	408,418	408,418
Ending balance (shares) at Dec. 31, 2014		60,637,525				3,365,561
Ending balance at Dec. 31, 2014	$ 1,198,400,000	$ 600,000	395,100,000	(12,600,000)	731,200,000	$ (112,600,000)	196,700,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options	1,100,000	0	1,100,000	0	0		0
Net income	43,700,000		0	0	19,400,000		24,300,000
Unrealized loss on cash flow hedges, net of deferred income tax benefit of $14.7 million, $4.0 million and $2.9 million for the years ended December 31, 2015, 2014 and 2013, respectively, and ineffectiveness loss (gain)of $21.6 million, $6.3 million and $(2.5) million for the years ended December 31, 2015, 2014 and 2013, respectively.	(27,400,000)	0	0	(27,400,000)	0	0	0
Other comprehensive loss from equity method investments, net of tax benefit of $2.7 million	(5,000,000)
Foreign currency translation loss	(300,000)		0		0	0	0
Common stock dividends ($0.45, $1.00 and $0.95 per share, for the years ended December 31, 2015, 2014 and 2013, respectively)	(37,100,000)	$ 0	0	0	(37,100,000)	0	0
Equity-based compensation expense	16,800,000		15,900,000	0	0	0	900,000
Distribution to non-controlling interest	(20,900,000)		0	0	0	$ 0	(20,900,000)
Purchase of common stock (shares)						(1,444,140)
Purchase of common stock	(42,200,000)		0	0	0	$ (42,200,000)	0
Income tax benefit of equity-based compensation expense	1,300,000		1,300,000				0
Stock issued in connection with the Alon Acquisition (shares)		6,000,000
Stock issued in connection with the Alon Acquisition	230,800,000	$ 100,000	230,700,000
Taxes paid due to the net settlement of equity-based compensation	$ (4,400,000)		(4,400,000)	0	0	$ 0	0
Exercise of equity-based awards (shares)	309,196	309,196
Stockholders' Equity, Other	$ 0		400,000				(400,000)
Ending balance (shares) at Dec. 31, 2015		66,946,721				4,809,701
Ending balance at Dec. 31, 2015	1,353,900,000	$ 700,000	639,200,000	(45,300,000)	713,500,000	$ (154,800,000)	200,600,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options	$ 200,000	$ 0	$ 200,000	$ 0	$ 0		$ 0