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Pension and Other Postretirement Benefit Programs
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefit Programs PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS
The following table summarizes our pension and postretirement expense:
 
Three Months Ended
June 30,
Six Months Ended June 30,
 
2020
 
2019
2020
 
2019
Defined-benefit pension, U.S.
 
 
 
 
 
 
Service cost
$
0.7

 
$
0.7

$
1.3

 
$
1.3

Interest cost
3.1

 
3.7

6.2

 
7.5

Expected return on plan assets
(5.4
)
 
(5.4
)
(10.7
)
 
(10.8
)
Amortization of net actuarial loss
2.5

 
2.4

5.1

 
4.8

Total, defined-benefit pension, U.S.
$
0.9

 
$
1.4

$
1.9

 
$
2.8

Defined-benefit pension, Canada
 
 
 
 
 
 
Interest cost
$
0.1

 
$
0.2

$
0.2

 
$
0.3

Expected return on plan assets
(0.2
)
 
(0.2
)
(0.3
)
 
(0.3
)
Amortization of net actuarial loss
0.1

 
—

0.2

 
0.1

Total, defined-benefit pension, Canada
$
—

 
$
—

$
0.1

 
$
0.1

Defined-benefit postretirement, U.S.
 
 
 
 
 
 
Service cost
$
—

 
$
—

$
—

 
$
0.1

Interest cost
0.5

 
0.7

1.0

 
1.3

Amortization of prior service credits
(0.1
)
 
—

(0.2
)
 
—

Amortization of net actuarial gains
(1.2
)
 
(0.8
)
(2.4
)
 
(1.6
)
Total, defined-benefit postretirement, U.S.
$
(0.8
)
 
$
(0.1
)
$
(1.6
)
 
$
(0.2
)