Tax Effects of Temporary Differences and Carryforwards that Give Rise to Deferred Income Tax Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Inventory reserves	$ 20.8	$ 21.7
Warranty reserves	14.1	12.5
Accrued liabilities	31.0	37.5
Net operating loss carryforward	24.0	22.4
Research and development credit carry forward	7.3	18.8
Alternative minimum tax credit carryforward	5.0	5.0
Other	10.0	5.6
Deferred Tax Assets, Gross, Total	112.2	123.5
Deferred tax liabilities:
Book to tax revenue differences	(13.4)	(31.7)
Intangible assets	(168.4)	(127.9)
Depreciation	(34.4)	(38.2)
Software development costs	(0.7)	(0.7)
Deferred Tax Liabilities, Net	(216.9)	(198.5)
Net deferred tax liability before valuation allowance	(104.7)	(75.0)
Valuation allowance	(31.1)	(26.5)
Net deferred tax liability	$ (135.8)	$ (101.5)