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Employee Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Components of net retirement cost
The following table summarizes the components of net retirement cost for the Company:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Expense Components
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
0.1

 
$
0.2

Interest
4.6

 
4.9

 
13.7

 
14.7

Expected return on plan assets
(6.9
)
 
(6.8
)
 
(20.6
)
 
(20.4
)
Amortization of actuarial loss
1.3

 
1.4

 
3.6

 
3.8

Defined benefit expense
(1.0
)
 
(0.5
)
 
(3.2
)
 
(1.7
)
Profit sharing
4.7

 
3.9

 
13.5

 
11.7

Multiemployer plan
0.5

 
0.6

 
1.6

 
1.6

Net expense
$
4.2

 
$
4.0

 
$
11.9

 
$
11.6