Consolidated Statement of Changes in Stockholders' Equity (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Net (loss) income	$ (176.6)
Net loss	(173.3)
Net change in unrealized losses on available-for-sale securities (net of $0.1 net tax benefit)	(0.2)
Net unrealized losses on cash flow hedges (net of $1.2 net tax benefit)	(55.7)
Postretirement plans and workers’ compensation obligations (net of $0.0 net tax benefit)	12.6
Foreign currency translation adjustment	(27.4)
Dividends paid	(0.7)
Share-based compensation for equity-classified awards	9.1
Employee stock purchases	2.0
Repurchase of employee common stock relinquished for tax withholding	(1.9)
Defined contribution plan share contribution	19.6
Distributions to noncontrolling interests	(1.5)
Ending Balance	2,509.1	2,726.5
Common Stock
Net (loss) income	0
Net change in unrealized losses on available-for-sale securities (net of $0.1 net tax benefit)	0
Net unrealized losses on cash flow hedges (net of $1.2 net tax benefit)	0
Postretirement plans and workers’ compensation obligations (net of $0.0 net tax benefit)	0
Foreign currency translation adjustment	0
Dividends paid	0
Share-based compensation for equity-classified awards	0
Employee stock purchases	0
Repurchase of employee common stock relinquished for tax withholding	0
Defined contribution plan share contribution	0
Distributions to noncontrolling interests	0
Ending Balance	2.9	2.9
Additional Paid-in Capital
Net (loss) income	0
Net change in unrealized losses on available-for-sale securities (net of $0.1 net tax benefit)	0
Net unrealized losses on cash flow hedges (net of $1.2 net tax benefit)	0
Postretirement plans and workers’ compensation obligations (net of $0.0 net tax benefit)	0
Foreign currency translation adjustment	0
Dividends paid	0
Share-based compensation for equity-classified awards	9.1
Employee stock purchases	2.0
Repurchase of employee common stock relinquished for tax withholding	0
Defined contribution plan share contribution	(1.4)
Distributions to noncontrolling interests	0
Ending Balance	2,393.0	2,383.3
Treasury Stock
Net (loss) income	0
Net change in unrealized losses on available-for-sale securities (net of $0.1 net tax benefit)	0
Net unrealized losses on cash flow hedges (net of $1.2 net tax benefit)	0
Postretirement plans and workers’ compensation obligations (net of $0.0 net tax benefit)	0
Foreign currency translation adjustment	0
Dividends paid	0
Share-based compensation for equity-classified awards	0
Employee stock purchases	0
Repurchase of employee common stock relinquished for tax withholding	(1.9)
Defined contribution plan share contribution	97.5
Distributions to noncontrolling interests	0
Ending Balance	(371.5)	(467.1)
Retained Earnings
Net (loss) income	(176.6)
Net change in unrealized losses on available-for-sale securities (net of $0.1 net tax benefit)	0
Net unrealized losses on cash flow hedges (net of $1.2 net tax benefit)	0
Postretirement plans and workers’ compensation obligations (net of $0.0 net tax benefit)	0
Foreign currency translation adjustment	0
Dividends paid	(0.7)
Share-based compensation for equity-classified awards	0
Employee stock purchases	0
Repurchase of employee common stock relinquished for tax withholding	0
Defined contribution plan share contribution	(76.5)
Distributions to noncontrolling interests	0
Ending Balance	1,316.7	1,570.5
Accumulated Other Comprehensive Loss
Net (loss) income	0
Net change in unrealized losses on available-for-sale securities (net of $0.1 net tax benefit)	(0.2)
Net unrealized losses on cash flow hedges (net of $1.2 net tax benefit)	(55.7)
Postretirement plans and workers’ compensation obligations (net of $0.0 net tax benefit)	12.6
Foreign currency translation adjustment	(27.4)
Dividends paid	0
Share-based compensation for equity-classified awards	0
Employee stock purchases	0
Repurchase of employee common stock relinquished for tax withholding	0
Defined contribution plan share contribution	0
Distributions to noncontrolling interests	0
Ending Balance	(835.5)	(764.8)
Noncontrolling Interests
Net (loss) income	3.3
Net change in unrealized losses on available-for-sale securities (net of $0.1 net tax benefit)	0
Net unrealized losses on cash flow hedges (net of $1.2 net tax benefit)	0
Postretirement plans and workers’ compensation obligations (net of $0.0 net tax benefit)	0
Foreign currency translation adjustment	0
Dividends paid	0
Share-based compensation for equity-classified awards	0
Employee stock purchases	0
Repurchase of employee common stock relinquished for tax withholding	0
Defined contribution plan share contribution	0
Distributions to noncontrolling interests	(1.5)
Ending Balance	$ 3.5	$ 1.7