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Employees (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost The components of net periodic benefit cost related to our benefit plans consisted of the following:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
Components of net periodic (benefit) cost:
2018
 
2017
 
2018
 
2017
Service cost
$
0.1

 
$
1.0

 
$
0.5

 
$
1.0

Interest cost
1.3

 
1.3

 
3.7

 
1.3

Expected return on plan assets
(2.1
)
 
(1.4
)
 
(5.7
)
 
(1.4
)
Recognition due to settlement
—

 
—

 
(0.1
)
 
—

Recognition due to curtailment gain
(2.4
)
 
(6.1
)
 
(2.4
)
 
(6.1
)
Net periodic benefit
$
(3.1
)
 
$
(5.2
)
 
$
(4.0
)
 
$
(5.2
)