Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net loss	$ (301.9)	$ (149.0)	$ (1,518.7)	$ (264.3)
Net change in unrealized gains (losses) on available-for-sale securities (net of respective net tax provision (benefit) of $0.0, ($0.2), $(0.1) and ($1.0))
Net change in unrealized gains (losses) on available-for-sale securities (net of respective net tax provision (benefit) of $0.0, ($0.2), $(0.1) and ($1.0))	0.2	(0.4)	0.2	(1.7)
Net unrealized (losses) gains on cash flow hedges (net of respective net tax (benefit) provision of $(30.1), ($104.2), $49.8 and $1.9)
(Decrease) increase in fair value of cash flow hedges	(115.6)	(180.6)	(100.4)	3.5
Reclassification for realized losses (gains) included in net loss	68.9	3.4	183.9	(1.6)
Net unrealized (losses) gains on cash flow hedges	(46.7)	(177.2)	83.5	1.9
Postretirement plans and workers' compensation obligations (net of respective net tax provision of $1.8, $4.0, $11.2 and $1.8)
Prior service cost for the period	0.0	0.0	0.0	(17.4)
Amortization of actuarial loss and prior service cost included in net loss	10.8	6.8	26.8	20.4
Postretirement plans and workers' compensation obligations	10.8	6.8	26.8	3.0
Foreign currency translation adjustment	(15.3)	(36.8)	(41.5)	(10.4)
Other comprehensive (loss) income, net of income taxes	(51.0)	(207.6)	69.0	(7.2)
Comprehensive loss	(352.9)	(356.6)	(1,449.7)	(271.5)
Less: Comprehensive income attributable to noncontrolling interests	2.8	1.6	7.9	8.1
Comprehensive loss attributable to common stockholders	$ (355.7)	$ (358.2)	$ (1,457.6)	$ (279.6)