Guarantees, Indemnities and Warranties - Additional Information (Detail) $ in Millions	Dec. 31, 2017 USD ($)
Guarantees [Abstract]
Guarantees, letters of credit and similar arrangements outstanding	$ 144.6

Guarantees, letters of credit and similar arrangements outstanding.

No definition available.

Name:	itt_GuaranteesLettersOfCreditAndSimilarArrangementsOutstanding
Namespace Prefix:	itt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant