Revised Changes in Product Support Liabilities (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Schedule Of Product Warranty Liability [Line Items]
Cost accruals and revenue deferrals	$ 490.0	$ 343.3
Payments and revenue recognized	(335.0)	(300.7)
Previously Reported
Schedule Of Product Warranty Liability [Line Items]
Cost accruals and revenue deferrals		238.0
Payments and revenue recognized		(195.4)
Revised
Schedule Of Product Warranty Liability [Line Items]
Cost accruals and revenue deferrals		343.3
Payments and revenue recognized		$ (300.7)