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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Compensation and Retirement Disclosure [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
 
 
2018
 
2017
 
2018
 
2017
Service cost
$
2.8

 
$
2.4

 
$
—

 
$
—

Interest cost
3.0

 
2.7

 
0.1

 
0.1

Expected return on assets
(2.8
)
 
(2.6
)
 
—

 
—

Other
0.4

 
0.6

 
(0.2
)
 
(0.1
)
Total benefit cost
$
3.4

 
$
3.1

 
$
(0.1
)
 
$
—