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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Components of net periodic benefit cost
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,
 
2018
 
2017
 
2018
 
2017
Service cost
$
2.8

 
$
2.4

 
$
5.6

 
$
4.8

Interest cost
2.9

 
2.8

 
5.9

 
5.5

Expected return on assets
(2.7
)
 
(2.6
)
 
(5.5
)
 
(5.2
)
Other
0.3

 
0.7

 
0.7

 
1.3

Total benefit cost
$
3.3

 
$
3.3

 
$
6.7

 
$
6.4


 
Retiree Health Care Plan
 
3 Months Ended
6 Months Ended
 
June 30,
June 30,
 
2018
 
2017
 
2018
 
2017
Interest cost
$
0.1

 
$
0.2

 
$
0.2

 
$
0.3

Prior service credit
(0.2
)
 
(0.2
)
 
(0.4
)
 
(0.3
)
Total benefit (credit) cost
$
(0.1
)
 
$
—

 
$
(0.2
)
 
$
—