XML 46 R19.htm IDEA: XBRL DOCUMENT v3.8.0.1
Pension and Other Post-Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Components of pension and other post retirement benefit costs

The following table shows the components of our pension and other post-retirement benefits expense for the three months ended March 31, 2018 and 2017 (in millions):

 
 
 
 
2018
Pension
Benefits
 
2017
Pension
Benefits
 
2018
Retiree Health and Life
 
2017
Retiree Health and Life
Service cost
$
1.9

 
$
1.6

 
$
0.1

 
$
—

Interest cost
3.7

 
3.8

 
0.2

 
0.2

Expected return on plan assets
(5.6
)
 
(6.0
)
 
—

 
—

Amortization of (1):
 
 
 
 
 
 
 
Unrecognized prior service credit
—

 
—

 
—

 
—

Unrecognized net actuarial loss (gain)
2.5

 
2.3

 
—

 
(0.1
)
Net periodic cost
$
2.5

 
$
1.7

 
$
0.3

 
$
0.1