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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
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
 
 
2019
 
2018
 
2019
 
2018
Service cost
 
$
2.5

 
$
2.8

 
$
—

 
$
—

Interest cost
 
3.1

 
3.0

 
0.1

 
0.1

Expected return on assets
 
(2.3
)
 
(2.8
)
 
—

 
—

Other
 
0.5

 
0.4

 
(0.2
)
 
(0.2
)
Total benefit cost (credit)
 
$
3.8

 
$
3.4

 
$
(0.1
)
 
$
(0.1
)