Immaterial Corrections Income Statement (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
Cost of sales	$ 387.1	$ 360.7	$ 1,184.9	$ 1,102.1
Gross profit	168.8	155.2	515.4	499.3
Sales and marketing expenses	42.6	43.6	137.7	128.9
General and administrative expenses	58.2	28.0	150.1	120.5
Operating income (loss)	36.9	(11.3)	131.1	25.6
Income (loss) from continuing operations before income tax expense	42.0	(33.8)	131.2	(40.5)
Income tax (benefit) expense	(18.8)	(4.3)	43.5	(8.2)
Income (loss) from continuing operations	60.8	(29.5)	87.7	(32.3)
Income (loss) from discontinued operations	12.2	138.0	5.3	431.8
Net income	73.0	108.5	93.0	399.5
As Previously Reported with Reclassification for Discontinued Operations [Member]
Cost of sales		358.3		1,099.3
Gross profit		157.6		502.1
Sales and marketing expenses		42.3		127.5
General and administrative expenses		41.8		133.9
Operating income (loss)		(21.4)		16.4
Income (loss) from continuing operations before income tax expense		(43.9)		(49.7)
Income tax (benefit) expense		(2.7)		(6.2)
Income (loss) from continuing operations		(41.2)		(43.5)
Income (loss) from discontinued operations		119.0		413.0
Net income		77.8		369.5
Adjustments [Member]
Cost of sales		2.4		2.8
Gross profit		(2.4)		(2.8)
Sales and marketing expenses		1.3		1.4
General and administrative expenses		(13.8)		(13.4)
Operating income (loss)		10.1		9.2
Income (loss) from continuing operations before income tax expense		10.1		9.2
Income tax (benefit) expense		(1.6)		(2.0)
Income (loss) from continuing operations		11.7		11.2
Income (loss) from discontinued operations		19.0		18.8
Net income		30.7		30.0
As Adjusted and with Reclassification for Discontinued Operations [Member]
Cost of sales		360.7		1,102.1
Gross profit		155.2		499.3
Sales and marketing expenses		43.6		128.9
General and administrative expenses		28.0		120.5
Operating income (loss)		(11.3)		25.6
Income (loss) from continuing operations before income tax expense		(33.8)		(40.5)
Income tax (benefit) expense		(4.3)		(8.2)
Income (loss) from continuing operations		(29.5)		(32.3)
Income (loss) from discontinued operations		138.0		431.8
Net income		$ 108.5		$ 399.5