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Retirement Plans (Tables)
 9 Months Ended
Sep. 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
9 Months Ended
 
September 30,
 
September 30,
 
2018
 
2017
 
2018
 
2017
Service cost
$
2.6

 
$
2.7

 
$
8.2

 
$
7.5

Interest cost
2.9

 
2.9

 
8.8

 
8.4

Expected return on assets
(2.6
)
 
(2.8
)
 
(8.1
)
 
(8.0
)
Other
0.4

 
0.1

 
1.1

 
1.4

Total benefit cost
$
3.3

 
$
2.9

 
$
10.0

 
$
9.3


 
Retiree Health Care Plan
 
3 Months Ended
9 Months Ended
 
September 30,
September 30,
 
2018
 
2017
 
2018
 
2017
Interest cost
$
0.1

 
$
0.1


$
0.3


$
0.4

Net Loss
$
0.1

 
$
0.1

 
$
0.1

 
$
0.1

Prior service credit
(0.2
)
 
(0.3
)
 
(0.6
)
 
(0.6
)
Total benefit credit
$
—

 
$
(0.1
)
 
$
(0.2
)
 
$
(0.1
)