Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Net (loss) income	$ (19.4)
Net income attributable to noncontrolling interest	(4.0)
Comprehensive income:
Net change in unrealized losses on available-for-sale securities (net of $3.8 tax benefit)	(6.3)
Net unrealized losses on cash flow hedges (net of $10.9 tax benefit)	8.4
Postretirement plans and workers' compensation obligations (net of $8.3 tax provision)	14.2
Foreign currency translation adjustment	1.1
Dividends paid	(22.9)
Share-based compensation	11.8
Write off of excess tax benefits related to share-based compensation	(3.9)
Employee stock purchases	3.4
Repurchase of employee common stock relinquished for tax withholding	(2.6)
Distributions to noncontrolling interests	(1.8)
Ending Balance	4,904.0	4,938.8
Common Stock
Comprehensive income:
Ending Balance	2.8	2.8
Additional Paid-in Capital
Comprehensive income:
Share-based compensation	11.8
Write off of excess tax benefits related to share-based compensation	(3.9)
Employee stock purchases	3.4
Ending Balance	2,297.6	2,286.3
Treasury Stock
Comprehensive income:
Repurchase of employee common stock relinquished for tax withholding	(2.6)
Ending Balance	(464.2)	(461.6)
Retained Earnings
Net (loss) income	(23.4)
Comprehensive income:
Dividends paid	(22.9)
Ending Balance	3,020.1	3,066.4
Accumulated Other Comprehensive Income (Loss)
Comprehensive income:
Net change in unrealized losses on available-for-sale securities (net of $3.8 tax benefit)	(6.3)
Net unrealized losses on cash flow hedges (net of $10.9 tax benefit)	8.4
Postretirement plans and workers' compensation obligations (net of $8.3 tax provision)	14.2
Foreign currency translation adjustment	1.1
Ending Balance	11.6	11.0
Noncontrolling Interests
Net income attributable to noncontrolling interest	(4.0)
Comprehensive income:
Distributions to noncontrolling interests	(1.8)
Ending Balance	$ 36.1	$ 33.9