Consolidated Statement of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Net income	$ 87.1		$ 207.8	$ 67.7		$ 386.1
Unrealized holding losses on available-for-sale securities	(7.6)		(2.6)	(13.8)		(14.1)
Less: Reclassification for realized losses included in net income	13.6	[1]	0	13.5	[1]	0
Net change in unrealized gains (losses) on available-for-sale securities	6.0		(2.6)	(0.3)		(14.1)
(Decrease) increase in fair value of cash flow hedges	(339.0)		42.7	(270.3)		190.5
Less: Reclassification for realized gains included in net income	(38.3)	[1]	(37.3)	(115.4)	[1]	(121.5)
Net unrealized (losses) gains on cash flow hedges	(377.3)		5.4	(385.7)		69.0
Amortization of actuarial loss and prior service cost for postretirement plans and workers' compensation obligations (net of respective tax provisions of $8.4, $8.0, $16.7 and $16.1)	14.2		13.8	28.4		27.7
Foreign currency translation adjustment	(74.5)		(6.1)	(73.4)		6.6
Other comprehensive (loss) income, net of income taxes	(431.6)		10.5	(431.0)		89.2
Comprehensive (loss) income	(344.5)		218.3	(363.3)		475.3
Less: Comprehensive (loss) income attributable to noncontrolling interests	(3.2)		3.1	0.8		8.7
Comprehensive (loss) income attributable to common stockholders	$ (341.3)		$ 215.2	$ (364.1)		$ 466.6

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