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Pension Plans and Postretirement Benefits (Tables)
 9 Months Ended
Oct. 01, 2017
Retirement Benefits [Abstract]  
Defined Benefit Pension Plans and Postretirement Benefit Plans
 
Third Quarter
 
Nine Months
Net periodic pension benefit (income) expense (in millions):
2017
 
2016
 
2017
 
2016
Service cost — benefits earned during the period
$
2.7

 
$
2.8

 
$
8.1

 
$
8.4

Interest cost on benefit obligation
9.1

 
10.2

 
27.4

 
30.4

Expected return on plan assets
(18.3
)
 
(18.8
)
 
(54.9
)
 
(56.3
)
Amortization of prior service cost
(1.5
)
 
(1.5
)
 
(4.5
)
 
(4.5
)
Amortization of net actuarial loss
7.3

 
6.8

 
21.9

 
20.4

Net periodic pension income
$
(0.7
)
 
$
(0.5
)
 
$
(2.0
)
 
$
(1.6
)
Teledyne sponsors several postretirement defined benefit plans that provide health care and life insurance benefits for certain eligible retirees.
 
Third Quarter
 
Nine Months
Net periodic postretirement benefits expense (in millions):
2017
 
2016
 
2017
 
2016
Interest cost on benefit obligation
$
0.1

 
$
0.1

 
$
0.3

 
$
0.4

Amortization of net actuarial gain
(0.1
)
 
(0.1
)
 
(0.3
)
 
(0.3
)
Net periodic postretirement expense
$
—

 
$
—

 
$
—

 
$
0.1