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Employee Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of net retirement cost
The following table summarizes the components of net retirement cost for the Company:
 
Three Months Ended
March 31,
 
2016
 
2015
 
(in millions)
Expense Components
 
 
 
Service cost
$
0.1

 
$
0.1

Interest
5.2

 
5.0

Expected return on plan assets
(6.8
)
 
(7.6
)
Amortization of actuarial loss
1.3

 
1.3

Defined benefit expense
(0.2
)
 
(1.2
)
Profit sharing
4.6

 
5.3

Multiemployer plan
0.6

 
0.6

Net expense
$
5.0

 
$
4.7