Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Net loss	$ (44.1)		$ (19.4)
Net change in unrealized holding losses on available-for-sale securities (net of respective tax benefits of $1.1 and $3.8)
Unrealized holding losses on available-for-sale securities	(1.8)		(6.2)
Less: Reclassification for realized gains included in net loss	0		(0.1)
Net change in unrealized losses on available-for-sale securities	(1.8)		(6.3)
Net unrealized gains (losses) on cash flow hedges (net of respective tax provision (benefit) of $68.9 and ($10.9))
Increase in fair value of cash flow hedges	116.2		68.7
Less: Reclassification for realized losses (gains) included in net loss	5.6	[1]	(77.1)	[1]
Net unrealized gains (losses) on cash flow hedges	121.8		(8.4)
Postretirement plans and workers' compensation obligations (net of respective tax (benefit) provision of ($6.2) and $8.3)
Prior service cost for the period	(17.4)		0
Amortization of actuarial loss and prior service cost included in net loss	6.8		14.2
Postretirement plans and workers' compensation obligations	(10.6)		14.2
Foreign currency translation adjustment	16.5		1.1
Other comprehensive income, net of income taxes	125.9		0.6
Comprehensive income (loss)	81.8		(18.8)
Less: Comprehensive income attributable to noncontrolling interests	4.4		4.0
Comprehensive income (loss) attributable to common stockholders	$ 77.4		$ (22.8)

[1] Presented as gains (losses) in the unaudited condensed consolidated statements of operations.