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Employee Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The following table presents the components of Net periodic benefit cost for the periods presented (in millions):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2019
 
2018
 
2019
 
2018
Service cost - benefits earning during the period
 
$
—

 
$
—

 
$
—

 
$
—

Interest cost on projected benefit obligation
 
1.3

 
1.4

 
2.7

 
2.7

Expected return on assets
 
(1.7
)
 
(2.0
)
 
(3.4
)
 
(3.9
)
Actuarial gain
 
—

 
—

 
—

 
—

Foreign currency gain (loss)
 
—

 
—

 
—

 
—

Net periodic benefit
 
$
(0.4
)
 
$
(0.6
)
 
$
(0.7
)
 
$
(1.2
)