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Employee Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Components of net retirement cost
The following table summarizes the components of our net retirement cost:
 
Three Months Ended
March 31,
 
2020
 
2019
 
(in millions)
Expense Components
 
 
 
Service cost
$
—

 
$
—

Interest
3.7

 
4.9

Expected return on plan assets
(5.2
)
 
(5.7
)
Amortization of actuarial loss
1.5

 
1.1

Amortization of prior service cost
0.3

 
—

Net periodic benefit cost
0.3

 
0.3

Profit sharing
2.7

 
2.2

Net expense
$
3.0

 
$
2.5