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Postretirement Benefit Plans - Changes in Projected Benefit Obligations of Pension and Other Employee-Related Defined Benefit Plans (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Change in benefit obligation      
Benefit obligation – January 1 $ 561.3 $ 546.1  
Service cost 6.3 5.9  
Interest cost 18.3 19.5  
Amendments 0.4 0.0  
Actuarial loss (gain) 8.2 (10.8)  
Benefits and expenses paid (32.7) (29.1)  
Acquired 0.0 37.4  
Settlement(a) (26.6) [1] (1.1)  
Curtailment (0.2) 2.0  
Foreign currency translation (2.1) (8.6)  
Benefit obligation – December 31 531.0 561.3 $ 546.1
U.S. Pension Plans [Member]      
Change in benefit obligation      
Benefit obligation – January 1 339.9 324.1  
Service cost 4.1 3.5 3.2
Interest cost 11.9 13.0 13.1
Amendments 0.0 0.0  
Actuarial loss (gain) 5.9 (14.9)  
Benefits and expenses paid (21.5) (18.5)  
Acquired 0.0 32.7  
Settlement(a) (28.0) [1] 0.0  
Curtailment 0.0 0.0  
Foreign currency translation 0.0 0.0  
Benefit obligation – December 31 312.3 339.9 324.1
International Pension Plan [Member]      
Change in benefit obligation      
Benefit obligation – January 1 78.0 87.5  
Service cost 1.3 1.5 1.6
Interest cost 1.5 1.5 2.4
Amendments 0.4 0.0  
Actuarial loss (gain) 4.2 (2.9)  
Benefits and expenses paid (2.7) (2.7)  
Acquired 0.0 2.8  
Settlement(a) (0.5) (1.1)  
Curtailment (0.2) 0.0  
Foreign currency translation (2.1) (8.6)  
Benefit obligation – December 31 79.9 78.0 87.5
Other Postretirement Benefit Plan, Defined Benefit [Member]      
Change in benefit obligation      
Benefit obligation – January 1 143.4 134.5  
Service cost 0.9 0.9 1.5
Interest cost 4.9 5.0 7.4
Amendments 0.0 0.0 [2]  
Actuarial loss (gain) (1.9) 7.0  
Benefits and expenses paid (8.5) (7.9)  
Acquired 0.0 1.9  
Settlement(a) 0.0 0.0  
Curtailment 0.0 2.0  
Foreign currency translation 0.0 0.0  
Benefit obligation – December 31 $ 138.8 $ 143.4 $ 134.5
[1] (a)During 2016, we recognized a non-cash pretax pension settlement charge of $12.7 as the result of a program offering certain former U.S. employees with a vested pension benefit an option to take a one-time lump sum distribution as part of ITT's overall plan to de-risk its pension plans. Approximately 1,100 participants accepted the offer, resulting in a payment of $28.0 from the plan and a reduction in the Company's projected benefit obligation of $26.6, including an actuarial loss of $1.4.
[2]
 
2016
 
2015
 
U.S.

 
Int’l

 
Other Benefits

 
Total

 
U.S.

 
Int’l

 
Other Benefits

 
Total

Change in benefit obligation
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Benefit obligation – January 1
$
339.9

 
$
78.0

 
$
143.4

 
$
561.3

 
$
324.1

 
$
87.5

 
$
134.5

 
$
546.1

Service cost
4.1

 
1.3

 
0.9

 
6.3

 
3.5

 
1.5

 
0.9

 
5.9

Interest cost
11.9

 
1.5

 
4.9

 
18.3

 
13.0

 
1.5

 
5.0

 
19.5

Amendments
—

 
0.4

 
—

 
0.4

 
—

 
—

 
—

 
—

Actuarial loss (gain)
5.9

 
4.2

 
(1.9
)
 
8.2

 
(14.9
)
 
(2.9
)
 
7.0

 
(10.8
)
Benefits and expenses paid
(21.5
)
 
(2.7
)
 
(8.5
)
 
(32.7
)
 
(18.5
)
 
(2.7
)
 
(7.9
)
 
(29.1
)
Acquired
—

 
—

 
—

 
—

 
32.7

 
2.8

 
1.9

 
37.4

Settlement(a)
(28.0
)
 
(0.5
)
 
—

 
(28.5
)
 
—

 
(1.1
)
 
—

 
(1.1
)
Curtailment
—

 
(0.2
)
 
—

 
(0.2
)
 
—

 
—

 
2.0

 
2.0

Foreign currency translation
—

 
(2.1
)
 
—

 
(2.1
)
 
—

 
(8.6
)
 
—

 
(8.6
)
Benefit obligation – December 31
$
312.3

 
$
79.9

 
$
138.8

 
$
531.0

 
$
339.9

 
$
78.0

 
$
143.4

 
$
561.3