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Company Transformation - Roll Forward of Transformational Accrual (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Components Of Transformation Costs [Line Items]
Transformation accrual - December 31, 2011			$ 33.9
Charges for actions during the period	2.2	132.8	19.7	279.4
Cash payments			(44.2)
Transformation accrual - September 30, 2012	9.4		9.4
Continuing Operations [Member]
Components Of Transformation Costs [Line Items]
Charges for actions during the period	2.6	19.8	11.9	84.2
Discontinued Operations [Member]
Components Of Transformation Costs [Line Items]
Charges for actions during the period	$ (0.4)	$ 113.0	$ 7.8	$ 195.2