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Employee Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Components of net retirement cost
The following table summarizes the components of our net retirement cost:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2019
 
2018
 
2019
 
2018
 
(in millions)
Expense Components
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
0.1

 
$
0.1

Interest
5.0

 
4.6

 
14.8

 
13.7

Expected return on plan assets
(5.8
)
 
(6.9
)
 
(17.3
)
 
(20.6
)
Amortization of actuarial loss
1.2

 
1.3

 
3.4

 
3.6

Net periodic benefit cost
0.4

 
(1.0
)
 
1.0

 
(3.2
)
Profit sharing
3.1

 
2.6

 
8.3

 
7.6

Net expense
$
3.5

 
$
1.6

 
$
9.3

 
$
4.4