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Employee Retirement Plans (Tables)
 6 Months Ended
Jun. 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
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Expense Components
 
 
 
 
 
 
 
Service cost
$
0.1

 
$
0.1

 
$
0.1

 
$
0.2

Interest
4.6

 
4.9

 
9.1

 
9.8

Expected return on plan assets
(6.9
)
 
(6.8
)
 
(13.7
)
 
(13.6
)
Amortization of actuarial loss
1.1

 
1.2

 
2.3

 
2.4

Defined benefit expense
(1.1
)
 
(0.6
)
 
(2.2
)
 
(1.2
)
Profit sharing
4.4

 
3.8

 
8.8

 
7.8

Multiemployer plan
0.5

 
0.4

 
1.1

 
1.0

Net expense
$
3.8

 
$
3.6

 
$
7.7

 
$
7.6