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Pension and Other Postretirement Benefits (Notes)
 9 Months Ended
Sep. 30, 2015
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Pension and Other Postretirement Benefits
Pension and Other Postretirement Benefits
 

The Company provides noncontributory pension and various healthcare and life insurance benefits to most employees and retirees. The Company contributed $24.1 to the master pension trust during 2015, which completes its required contributions for 2015. No contributions to the master pension trust are required for 2016. Based on funding projections as of the beginning of 2015, no contributions to the master pension trust are required for 2017, though future funding projections in 2017 and beyond could be affected by differences between expected and actual returns on plan assets, actuarial data and assumptions relating to plan participants, the interest rate used to measure the pension obligations and changes to regulatory funding requirements.

Net periodic benefit cost (income) for pension and other postretirement benefits was as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
Pension Benefits
 
 
 
 
 
 
 
Service cost
$
0.5

 
$
0.5

 
$
1.6

 
$
1.2

Interest cost
32.5

 
36.6

 
97.5

 
109.6

Expected return on assets
(49.5
)
 
(50.7
)
 
(148.9
)
 
(152.1
)
Amortization of prior service cost
1.1

 
1.1

 
3.3

 
3.2

Amortization of loss
7.8

 
1.1

 
23.4

 
1.2

Settlement loss
—

 
0.2

 
—

 
0.2

Net periodic benefit cost (income)
$
(7.6
)
 
$
(11.2
)
 
$
(23.1
)
 
$
(36.7
)
 
 
 
 
 
 
 
 
Other Postretirement Benefits
 
 
 
 
 
 
 
Service cost
$
1.8

 
$
1.1

 
$
5.4

 
$
3.1

Interest cost
5.7

 
5.2

 
16.9

 
15.3

Amortization of prior service cost (credit)
(16.2
)
 
(18.3
)
 
(48.5
)
 
(54.9
)
Amortization of (gain) loss
0.4

 
(0.3
)
 
1.2

 
(1.0
)
Net periodic benefit cost (income)
$
(8.3
)
 
$
(12.3
)
 
$
(25.0
)
 
$
(37.5
)