Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Net loss	$ (44.1)
Net (loss) income attributable to common stockholders	(48.5)
Net income attributable to noncontrolling interests	4.4
Net change in unrealized holding losses on available-for-sale securities (net of $1.1 tax benefit)	(1.8)
Net unrealized gains on cash flow hedges (net of $68.9 tax provision)	121.8
Postretirement plans and workers’ compensation obligations (net of $6.2 tax benefit)	(10.6)
Foreign currency translation adjustment	16.5
Dividends paid	(23.1)
Share-based compensation	13.5
Write-off of excess tax benefits related to share-based compensation	(4.8)
Stock options exercised	0.6
Employee stock purchases	2.6
Repurchase of employee common stock relinquished for tax withholding	(2.0)
Distributions to noncontrolling interests	(0.8)
Ending Balance	4,015.7	3,947.9
Common Stock
Dividends paid
Stock options exercised	0.1
Ending Balance	2.9	2.8
Additional Paid-in Capital
Dividends paid
Share-based compensation	13.5
Write-off of excess tax benefits related to share-based compensation	(4.8)
Stock options exercised	0.5
Employee stock purchases	2.6
Ending Balance	2,351.8	2,340.0
Treasury Stock
Dividends paid
Ending Balance	(466.7)	(464.7)
Retained Earnings
Net (loss) income attributable to common stockholders	(48.5)
Dividends paid	(23.1)
Ending Balance	2,378.2	2,449.8
Accumulated Other Comprehensive Loss
Net change in unrealized holding losses on available-for-sale securities (net of $1.1 tax benefit)	(1.8)
Net unrealized gains on cash flow hedges (net of $68.9 tax provision)	121.8
Postretirement plans and workers’ compensation obligations (net of $6.2 tax benefit)	(10.6)
Foreign currency translation adjustment	16.5
Dividends paid
Ending Balance	(293.3)	(419.2)
Noncontrolling Interests
Net income attributable to noncontrolling interests	4.4
Dividends paid
Distributions to noncontrolling interests	(0.8)
Ending Balance	$ 42.8	$ 39.2