Acquisitions and Divestitures Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Long Lived Assets Held-for-sale [Line Items]
Adjustment to carrying value of disposal group			$ (5.5)	$ 0
Discontinued operations	(8.7)	(2.5)	(17.5)	(8.0)
XtremeMac and Memorex [Member]
Long Lived Assets Held-for-sale [Line Items]
Disposal group, net revenue	10.5	20.8	33.9	60.6
Loss from operations of discontinued businesses, before income taxes	(3.2)	(2.8)	(12.0)	(8.9)
Adjustment to carrying value of disposal group	(5.5)	0	(5.5)	0
Income tax benefit	0	(0.3)	0	(0.9)
Discontinued operations	$ (8.7)	$ (2.5)	$ (17.5)	$ (8.0)

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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