Basis of Presentation (Narrative) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Basis Of Presentation [Line Items]
Date of emergence from bankruptcy proceedings			Nov. 21, 2005
Fresh-start accounting adoption, date			Oct. 01, 2005
Cumulative effect of changes in estimates of long term construction contract on operating income	$ (4)	$ 7	$ 1	$ 33
Cumulative effect of changes in estimates of long term construction contract on diluted Earnings Per Share	$ (0.07)	$ 0.14	$ 0.01	$ 0.63
Cash and Cash equivalents Disposal Group	7.7		7.7
Derivatives Foreign Exchange Contracts Disposal Group	$ 2.0		$ 2.0