Revised Changes in Product Support Liabilities (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended		3 Months Ended		6 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014 Previously Reported	Mar. 31, 2013 Previously Reported	Jun. 30, 2013 Previously Reported	Mar. 31, 2014 Revised	Mar. 31, 2013 Revised	Jun. 30, 2013 Revised
Schedule Of Product Warranty Liability [Line Items]
Cost accruals and revenue deferrals	$ 322.2	$ 224.7	$ 130.8	$ 68.6	$ 158.3	$ 170.2	$ 103.3	$ 224.7
Payments and revenue recognized	$ (228.9)	$ (196.7)	$ (74.8)	$ (58.5)	$ (130.3)	$ (114.2)	$ (93.2)	$ (196.7)