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Retirement Plans
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Retirement Plans
Retirement Plans

The components of the net periodic benefit cost for our plans were as follows:
 
3 Months Ended March 31,
 
Defined Benefit Pension Plans
Retiree Health Care Plan
 
 
2016
 
2015
 
2016
 
2015
Service cost
$
1.6

 
$
1.8

 
$
—

 
$
—

Interest cost
3.0

 
2.7

 
0.2

 
0.2

Expected return on assets
(2.9
)
 
(2.8
)
 
—

 
—

Other
0.3

 
1.1

 
(0.2
)
 
(0.2
)
Total benefit cost
$
2.0

 
$
2.8

 
$
—

 
$
—


During the three months ended March 31, 2016, contributions made to our pension plans were $1.1 and contributions made to our retiree health care plan were $0.3. During 2016, we expect to make total contributions of approximately $11.6 to our pension plans and to fund our retiree health care payments as incurred.