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Pension and Other Postretirement Benefit Plans
 9 Months Ended
Sep. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Pension and Other Postretirement Benefit Plans
Pension Benefits

The components of net periodic cost (benefit) are as follows:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
(in millions)
2017
 
2016
 
2017
 
2016
Service cost
$
1.2

 
$
1.2

 
$
3.6

 
$
3.5

Interest cost
7.2

 
8.2

 
21.6

 
24.5

Expected return on plan assets
(13.9
)
 
(14.5
)
 
(41.7
)
 
(43.3
)
Amortization of prior service cost
(0.1
)
 
(0.2
)
 
(0.3
)
 
(0.5
)
Amortization of net loss
3.5

 
2.9

 
10.5

 
8.7

Net periodic benefit
$
(2.1
)
 
$
(2.4
)
 
$
(6.3
)
 
$
(7.1
)

The Company expects, based on current actuarial calculations, to contribute approximately $12.0 million to its defined benefit plans, of which $5.4 million has been contributed during the first nine months of 2017. The Company contributed $8.3 million to its defined benefit plans in 2016. 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.