CONSOLIDATED STATEMENTS OF CHANGES IN OWNERS' EQUITY AND SERIES A PREFERRED STOCK - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Shares [Member]	Noncontrolling Interests [Member]		Series A Preferred Stock [Member]
Balance at Dec. 31, 2013	$ 2,091.3	$ 0.0	$ 151.6	$ 20.5	$ (0.5)	$ (22.8)	$ 1,942.5
Balance (in shares) at Dec. 31, 2013		42,162,000				367,000
Series A Preferred Stock at Dec. 31, 2013									$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation on equity grants	15.3	$ 0.0	6.1	0.0	0.0	$ 0.0	9.2		0.0
Compensation on equity grants (in shares)		0				0
Distribution equivalent rights	(1.4)	$ 0.0	0.0	0.0	0.0	$ 0.0	(1.4)		0.0
Shares issued under compensation program (in shares)		3,000				0
Shares and units tendered for tax withholding obligations	(7.4)	$ 0.0	0.0	0.0	0.0	$ (2.6)	(4.8)		0.0
Shares and units tendered for tax withholding obligations (in shares)		(22,000)				22,000
Sale of Partnership limited partner interests	408.4	$ 0.0	0.0	0.0	0.0	$ 0.0	408.4		0.0
Impact of Partnership/subsidiary equity transactions	0.0	0.0	23.0	0.0	0.0	0.0	(23.0)		0.0
Dividends	(113.1)	0.0	0.0	(113.1)	0.0	0.0	0.0		0.0
Common stock dividends
Dividends in excess of retained earnings	0.0	0.0	(15.8)	15.8	0.0	0.0	0.0		0.0
Distributions to noncontrolling interests	(339.8)	0.0	0.0	0.0	0.0	0.0	(339.8)		0.0
Other comprehensive income (loss)	63.2	0.0	0.0	0.0	5.3	0.0	57.9		0.0
Net income (loss)	423.0	0.0	0.0	102.3	0.0	0.0	320.7		0.0
Balance at Dec. 31, 2014	2,539.5	$ 0.0	164.9	25.5	4.8	$ (25.4)	2,369.7		0.0
Balance (in shares) at Dec. 31, 2014		42,143,000				389,000
Series A Preferred Stock at Dec. 31, 2014									0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation on equity grants	26.1	$ 0.0	9.5	0.0	0.0	$ 0.0	16.6		0.0
Compensation on equity grants (in shares)		0				0
Distribution equivalent rights	(2.4)	$ 0.0	(0.8)	0.0	0.0	$ 0.0	(1.6)		0.0
Shares issued under compensation program (in shares)		50,000				0
Shares and units tendered for tax withholding obligations	(8.8)	$ 0.0	0.0	0.0	0.0	$ (3.3)	(5.5)		0.0
Shares and units tendered for tax withholding obligations (in shares)		(37,000)				37,000
Sale of Partnership limited partner interests	436.0	$ 0.0	0.0	0.0	0.0	$ 0.0	436.0		0.0
Issuance of common stock	335.5	$ 0.0	335.5	0.0	0.0	$ 0.0	0.0		0.0
Issuance of common stock (in shares)		3,738,000				0
Impact of Partnership/subsidiary equity transactions			56.8				(56.8)
Dividends	(179.0)	$ 0.0	0.0	(179.0)	0.0	$ 0.0	0.0		0.0
Common stock dividends
Dividends in excess of retained earnings	0.0	0.0	(122.1)	122.1	0.0	0.0	0.0		0.0
Distributions to noncontrolling interests	(514.8)	0.0	0.0	0.0	0.0	0.0	(514.8)		0.0
Distributions payable to preferred unitholders	(0.9)	0.0	0.0	0.0	0.0	0.0	(0.9)		0.0
Contributions from noncontrolling interests	78.4	0.0	0.0	0.0	0.0	0.0	78.4		0.0
Noncontrolling interests in acquired subsidiaries	216.8	0.0	0.0	0.0	0.0	0.0	216.8		0.0
Common stock issued in ATLS merger	1,013.7	$ 0.1	1,013.6	0.0	0.0	$ 0.0	0.0		0.0
Common stock issued in ATLS merger (in shares)		10,126,000				0
Partnership units issued in APL merger	2,435.7	$ 0.0	0.0	0.0	0.0	$ 0.0	2,435.7		0.0
Other comprehensive income (loss)	25.8	0.0	0.0	0.0	0.9	0.0	24.9		0.0
Net income (loss)	(151.4)	0.0	0.0	58.3	0.0	0.0	(209.7)		0.0
Balance at Dec. 31, 2015	6,250.2	$ 0.1	1,457.4	26.9	5.7	$ (28.7)	4,788.8
Balance (in shares) at Dec. 31, 2015		56,020,000				426,000
Series A Preferred Stock at Dec. 31, 2015									0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation on equity grants	29.7	$ 0.0	27.5	0.0	0.0	$ 0.0	2.2		$ 0.0
Compensation on equity grants (in shares)		0				0			0
Distribution equivalent rights	(8.9)	$ 0.0	(8.7)	0.0	0.0	$ 0.0	(0.2)		$ 0.0
Shares issued under compensation program (in shares)		364,000				0			0
Shares and units tendered for tax withholding obligations	(3.6)	$ 0.0	0.0	0.0	0.0	$ (3.5)	(0.1)		$ 0.0
Shares and units tendered for tax withholding obligations (in shares)		(88,000)				88,000			0
Issuance of common stock	572.7	$ 0.0	572.7	0.0	0.0	$ 0.0	0.0		$ 0.0
Issuance of common stock (in shares)		12,562,000				0
Issuance of Series A Preferred and detachable warrants	796.6	$ 0.0	796.6	0.0	0.0	$ 0.0	0.0
Series A Preferred Stock									172.6
Exercise of warrants - share settled	0.0	$ 0.0	0.0	0.0	0.0	$ 0.0	0.0		0.0
Exercise of warrants - share settled (in shares)		11,336,856				0
Series A Preferred Stock dividends
Dividends declared or accrued	(72.6)	$ 0.0	0.0	(72.6)	0.0	$ 0.0	0.0		0.0
Dividends in excess of retained earnings	0.0	0.0	(68.8)	68.8	0.0	0.0	0.0		0.0
Deemed dividends - accretion of beneficial conversion feature	(18.2)	0.0	(18.2)	0.0	0.0	0.0	0.0		18.2
Common stock dividends
Dividends declared	(513.7)	0.0	0.0	(513.7)	0.0	0.0	0.0		0.0
Dividends in excess of retained earnings	0.0	0.0	(490.6)	490.6	0.0	0.0	0.0		0.0
Distributions to noncontrolling interests	(177.0)	0.0	0.0	0.0	0.0	0.0	(177.0)		0.0
Contributions from noncontrolling interests	43.3	0.0	0.0	0.0	0.0	0.0	43.3		0.0
Noncontrolling interests in acquired subsidiaries	(880.1)	$ 0.1	3,183.7	0.0	55.8	$ 0.0	(4,119.7)		$ 0.0
Acquisition of TRP noncontrolling common interests, net of acquisition costs and deferred income taxes (in shares)		104,526,000				0			0
Common stock issued in ATLS merger	(2,316.6)	$ 0.1	1,803.0				(4,119.7)	[1]
Purchase of noncontrolling interests in subsidiary, net of tax impact	(47.6)	0.0	54.6	0.0	0.0	$ 0.0	(102.2)		$ 0.0
Other comprehensive income (loss)	(87.3)	0.0	0.0	0.0	(99.8)	0.0	12.5		0.0
Net income (loss)	(159.1)	0.0	0.0	(187.3)	0.0	0.0	28.2		0.0
Balance at Dec. 31, 2016	$ 5,724.4	$ 0.2	$ 5,506.2	$ (187.3)	$ (38.3)	$ (32.2)	$ 475.8
Balance (in shares) at Dec. 31, 2016		184,721,000				514,000
Series A Preferred Stock at Dec. 31, 2016									$ 190.8

[1] Reflects the February 17, 2016 book value of the publicly held interests in TRP.