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Employee Retirement Plans
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Employee Retirement Plans Employee Retirement Plans
The following table summarizes the components of our net retirement cost:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2019
 
2018
 
2019
 
2018
 
(in millions)
Expense Components
 
 
 
 
 
 
 
Service cost
$
0.1

 
$
0.1

 
$
0.1

 
$
0.1

Interest
4.9

 
4.6

 
9.8

 
9.1

Expected return on plan assets
(5.8
)
 
(6.9
)
 
(11.5
)
 
(13.7
)
Amortization of actuarial loss
1.1

 
1.1

 
2.2

 
2.3

Net periodic benefit cost
0.3

 
(1.1
)
 
0.6

 
(2.2
)
Profit sharing
3.0

 
2.5

 
5.2

 
5.0

Net expense
$
3.3

 
$
1.4

 
$
5.8

 
$
2.8


We had no contributions to our defined benefit pension plans for the three months ended June 30, 2019. We contributed $0.2 million to our defined benefit pension plans for the six months ended June 30, 2019. We contributed $3.0 million and $3.7 million to our defined benefit pension plans for the three and six months ended June 30, 2018, respectively. We do not expect any further contributions to our defined benefit pension plans in 2019. The non-service cost components of net periodic benefit cost shown in the table above are included in the Other, net line in our Consolidated Statements of Operations.