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Retirement Plans
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Retirement Plans
Retirement Plans

The components of the net periodic benefit cost for our plans were as follows:

 
Defined Benefit Pension Plans
 
3 Months Ended
9 Months Ended
 
September 30,
September 30,
 
2015
 
2014
 
2015
 
2014
Service cost
$
1.8

 
$
2.0

 
$
5.3

 
$
6.1

Interest cost
2.7

 
3.3

 
8.1

 
10.0

Expected return on assets
(2.8
)
 
(3.3
)
 
(8.4
)
 
(10.1
)
Other
1.1

 
1.0

 
3.3

 
3.0

Total benefit cost
$
2.8

 
$
3.0

 
$
8.3

 
$
9.0



 
Retiree Health Care Plan
 
3 Months Ended
9 Months Ended
 
September 30,
September 30,
 
2015
 
2014
 
2015
 
2014
Interest cost
$
0.2

 
$
0.2

 
$
0.5

 
$
0.6

Net loss
0.4

 
0.1

 
0.1

 
0.1

Prior service credit
(0.6
)
 
—

 
(0.6
)
 
—

Total benefit cost
$
—

 
$
0.3

 
$
—

 
$
0.7



During the three and nine months ended September 30, 2015, contributions made to our pension plans were $2.8 and $8.1, respectively, and contributions made to our retiree health care plan were $0.2 and $0.9, respectively. During 2015, we expect to make total contributions of approximately $12.4 to our pension plans and to fund our retiree health care payments as incurred.