Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Fair Value Option Quantitative Disclosures [Line Items]
Unbilled accounts receivables	$ 119.9		$ 97.1
Customer deposits	84.4		82.8
Provisions for loss contracts	13.5		14.2
Deferred pre-production costs	17.1		20.5
Interest rate on notional value	1.415%
Foreign exchange transaction gains (losses) recognized in other income (expense)	(0.9)	0.4
Forward Starting Interest Rate Swap Agreement
Fair Value Option Quantitative Disclosures [Line Items]
Interest rate swap agreements, notional amount	150.0
Interest rate swap agreement termination date	Nov. 07, 2016
Current liability	4.1
Interest rate swap, accumulated other comprehensive loss	$ 2.5