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Employee Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Components of net retirement cost
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