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Employee Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 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
March 31,
 
2018
 
2017
 
(in millions)
Expense Components
 
 
 
Service cost
$
—

 
$
0.1

Interest
4.5

 
4.9

Expected return on plan assets
(6.8
)
 
(6.8
)
Amortization of actuarial loss
1.2

 
1.2

Defined benefit expense
(1.1
)
 
(0.6
)
Profit sharing
4.4

 
4.0

Multiemployer plan
0.6

 
0.6

Net expense
$
3.9

 
$
4.0