Debt - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Commercial Paper	$ 114,400,000	$ 162,400,000
Short-term loans	0
ITT 2014 Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Revolving credit facility	500,000,000
Maximum face amount outstanding on letters of credit	100,000,000
Minimum amount of reduce commitments	10,000,000
Maximum potential increase in credit facility	200,000,000
Maximum potential credit facility outstanding	$ 700,000,000
Maximum Leverage Ratio Under Credit Facility	3.00
Minimum leverage ratio under credit facility	1.00
Maximum interest coverage ratio under credit facility	3.00
Minimum interest coverage ratio under credit facility	1.00
Commercial Paper [Member]
Debt Instrument [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time	0.06%	2.09%