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Components of Net Periodic Benefit Cost
 9 Months Ended
Sep. 30, 2016
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
Components of Net Periodic Benefit Cost
 
Benefit costs for defined benefit pension and other postretirement plans are shown below.  The funding policy and assumptions disclosed in the Company’s 2015 Annual Report on Form 10-K are expected to continue unchanged throughout 2016.
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
Pension Benefits
 
Other Benefits
 
Pension Benefits
 
Other Benefits
(in millions)
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost - benefits earned during the period
 
$
1.9

 
$
1.9

 
$
—

 
$
—

 
$
5.7

 
$
5.8

 
$
—

 
$
—

Interest cost on projected benefit obligation
 
8.2

 
8.2

 
—

 
0.1

 
24.6

 
24.5

 
0.1

 
0.2

Expected return on plan assets
 
(12.9
)
 
(12.7
)
 
—

 
—

 
(38.7
)
 
(38.1
)
 
—

 
—

Settlement loss
 
0.1

 
—

 
—

 
—

 
6.0

 
—

 
—

 
—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Unrecognized transition obligation
 
—

 
0.1

 
—

 
—

 
—

 
0.1

 
—

 
—

Prior service cost
 
0.2

 
0.2

 
—

 
—

 
0.6

 
0.7

 
(0.2
)
 
—

Actuarial net loss (gain)
 
3.6

 
5.0

 
(0.2
)
 
(0.1
)
 
10.9

 
15.1

 
(0.5
)
 
(0.2
)
Net periodic benefit cost
 
$
1.1

 
$
2.7

 
$
(0.2
)
 
$
—

 
$
9.1

 
$
8.1

 
$
(0.6
)
 
$
—


 
In the three months ended June 30, 2016, the Company recognized a $5.8 million pension settlement charge related to supplemental pension plan lump sum payments. Costs for defined contribution pension plans were $1.1 million and $9.1 million for the three and nine months ended September 30, 2016, respectively. Costs for defined contribution pension plans were $4.9 million and $14.6 million for the three and nine months ended September 30, 2015, respectively.