Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Noncontrolling Interests [Member]	Equity Award
Beginning Balance at Dec. 31, 2013	$ 3,947.9	$ 0.2	$ 2,342.6	$ (464.7)	$ 2,449.8	$ (419.2)	$ 39.2
Net loss	(777.3)
Net loss attributable to common stockholders	(787.0)				(787.0)
Less: Net income attributable to noncontrolling interests	9.7						9.7
Net change in unrealized gains (losses) on available-for-sale securities, net of tax	(0.8)					(0.8)
Net unrealized gains (losses) on cash flow hedges	(205.2)					(205.2)
Foreign currency translation adjustment	(41.0)					(41.0)
Dividends paid	(92.3)				(92.3)
Share-based Compensation for equity-classified awards	46.1		46.1					$ 46.1
Excess (write-off) tax benefits related to share-based compensation	(8.3)		(8.3)
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	5.5
Defined contribution plan share contribution	0.5		0.5
Postretirement plans and workers' compensation obligations	(98.6)					(98.6)
Employee stock purchases	5.1		5.1
Repurchase of employee common stock relinquished for tax withholding	(2.4)		0.0	(2.4)
Distributions to Non controlling interest	4.7						(4.7)
Dividend payable to noncontrolling interests	(42.5)						(42.5)
Ending Balance at Dec. 31, 2014	2,726.5	0.2	2,386.0	(467.1)	1,570.5	(764.8)	1.7
Net loss	(1,988.9)
Net loss attributable to common stockholders	(1,996.0)				(1,996.0)
Less: Net income attributable to noncontrolling interests	7.1						7.1
Net change in unrealized gains (losses) on available-for-sale securities, net of tax	0.0
Net unrealized gains (losses) on cash flow hedges	120.4					120.4
Foreign currency translation adjustment	(34.9)					(34.9)
Dividends paid	(1.4)				(1.4)
Share-based Compensation for equity-classified awards	26.2		26.2					26.2
Excess (write-off) tax benefits related to share-based compensation	0.0	0.0	(3.5)	0.0	0.0	0.0	0.0
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	3.4
Defined contribution plan share contribution	19.6		(1.4)	97.5	(76.5)
Postretirement plans and workers' compensation obligations	60.4					60.4
Employee stock purchases	(4.0)		3.4				(0.5)
Repurchase of employee common stock relinquished for tax withholding	(2.1)			(2.1)
Consolidation of noncontrolling interests	1.6	0.0	0.0	0.0	0.0	0.0	1.6
Dividend payable to noncontrolling interests	(6.3)						(6.3)
Dividend payable to noncontrolling interests	(2.0)						(2.0)
Ending Balance at Dec. 31, 2015	918.5	0.2	2,410.7	(371.7)	(503.4)	(618.9)	1.6
Net loss	(731.9)
Net loss attributable to common stockholders	(739.8)				(739.8)
Less: Net income attributable to noncontrolling interests	7.9						7.9
Net unrealized gains (losses) on cash flow hedges	146.3					146.3
Foreign currency translation adjustment	(1.8)					(1.8)
Share-based Compensation for equity-classified awards			11.3					$ 11.3
Excess (write-off) tax benefits related to share-based compensation	0.0
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	0.0
Postretirement plans and workers' compensation obligations	(2.6)					(2.6)
Repurchase of employee common stock relinquished for tax withholding	(0.1)			(0.1)
Dividend payable to noncontrolling interests	(1.9)	0.0	0.0	0.0	0.0	0.0	(1.9)
Dividend payable to noncontrolling interests		0.0	0.0	0.0	0.0	0.0
Ending Balance at Dec. 31, 2016	$ 337.8	$ 0.2	$ 2,422.0	$ (371.8)	$ (1,243.2)	$ (477.0)	$ 7.6