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Employee Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Components of net retirement cost
The following table summarizes the components of our net retirement cost:
 
Three Months Ended
March 31,
 
2019
 
2018
 
(in millions)
Expense Components
 
 
 
Service cost
$
—

 
$
—

Interest
4.9

 
4.5

Expected return on plan assets
(5.7
)
 
(6.8
)
Amortization of actuarial loss
1.1

 
1.2

Net periodic benefit cost
0.3

 
(1.1
)
Profit sharing
2.2

 
2.5

Net expense
$
2.5

 
$
1.4