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Retirement Plans
 6 Months Ended
Jun. 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
6 Months Ended
 
June 30,
June 30,
 
2015
 
2014
 
2015
 
2014
Service cost
$
1.7

 
$
2.1

 
$
3.5

 
$
4.1

Interest cost
2.7

 
3.4

 
5.4

 
6.7

Expected return on assets
(2.8
)
 
(3.5
)
 
(5.6
)
 
(6.8
)
Other
1.1

 
1.0

 
2.2

 
2.0

Total benefit cost
$
2.7

 
$
3.0

 
$
5.5

 
$
6.0



 
Retiree Health Care Plan
 
3 Months Ended
6 Months Ended
 
June 30,
June 30,
 
2015
 
2014
 
2015
 
2014
Interest cost
$
0.1

 
$
0.2

 
$
0.3

 
$
0.4

Net loss
(0.1
)
 
—

 
(0.3
)
 
—

Total benefit cost
$
—

 
$
0.2

 
$
—

 
$
0.4



During the three and six months ended June 30, 2015, contributions made to our pension plans were $2.6 and $5.3, respectively, and contributions made to our retiree health care plan were $0.4 and $0.7, 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.