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Pension and Other Postretirement Benefit Plans
 6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Pension and Other Postretirement Benefit Plans
Pension and Other Postretirement Benefit Plans
The components of net periodic cost are as follows:
 
Three Months Ended June 30, 2015
 
Six Months Ended June 30, 2014
(in millions)
Pension Benefits
 
Other
Postretirement
Benefits
 
Pension Benefits
 
Other
Postretirement
Benefits
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
$
1.2

 
$
1.3

 
$
—

 
$
—

 
$
2.7

 
$
2.5

 
$
—

 
$
—

Interest cost
9.4

 
10.2

 
0.1

 
0.1

 
19.0

 
20.5

 
0.2

 
0.2

Expected return on plan assets
(15.4
)
 
(15.7
)
 
—

 
—

 
(31.2
)
 
(31.4
)
 
—

 
—

Amortization of prior service cost
(0.2
)
 
—

 
(0.1
)
 
(0.1
)
 
(0.1
)
 
0.1

 
(0.1
)
 
(0.1
)
Amortization of net loss (gain)
3.1

 
1.3

 
(0.1
)
 
(0.1
)
 
6.2

 
2.5

 
(0.3
)
 
(0.1
)
Net periodic cost
$
(1.9
)
 
$
(2.9
)
 
$
(0.1
)
 
$
—

 
$
(3.4
)
 
$
(5.9
)
 
$
(0.2
)
 
$
—


The Company expects, based on current actuarial calculations, to contribute approximately $17.0 million to its defined benefit plans and $1.0 million to its other postretirement benefit plans in 2015, of which $8.1 million and $0.1 million have been contributed during the first six months of 2015, respectively. The Company contributed $24.5 million to its defined benefit plans and $1.0 million to its other postretirement benefit plans in 2014. Cash contributions for subsequent years will depend on a number of factors, including the impact of the Pension Protection Act signed into law in 2006, changes in minimum funding requirements, long-term interest rates, the investment performance of plan assets and changes in employee census data affecting the Company’s projected benefit obligations.