XML 42 R30.htm IDEA: XBRL DOCUMENT v3.8.0.1
Pension and Postretirement Health and Life Benefits (Tables)
 9 Months Ended
Sep. 30, 2017
Pension Plan, Defined Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs

The components of net periodic benefit cost (credit) for the defined benefit pension plans were as follows (in millions):
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2017
 
2016
 
2017
 
2016
Service costs
$
0.9

 
$
1.0

 
$
2.8

 
$
2.9

Interest costs
8.0

 
8.9

 
24.1

 
26.6

Expected gains on plan assets
(10.1
)
 
(10.6
)
 
(30.5
)
 
(31.6
)
Actuarial loss from remeasurement
—

 
—

 
—

 
0.8

Net periodic benefit credit
$
(1.2
)
 
$
(0.7
)
 
$
(3.6
)
 
$
(1.3
)
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs
The components of net periodic benefit cost for the postretirement health and life benefit plans were as follows (in millions):
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2017
 
2016
 
2017
 
2016
Interest costs
$
1.8

 
$
2.1

 
$
5.4

 
$
6.1

Expected gains on plan assets
—

 
(0.1
)
 
—

 
(0.2
)
Amortization of prior service credits, net
—

 
(0.1
)
 
(0.1
)
 
(0.2
)
Net periodic benefit cost
$
1.8

 
$
1.9

 
$
5.3

 
$
5.7