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Employee Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2015
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,
 
2015
 
2014
 
(in millions)
Expense Components
 
 
 
Defined benefit:
 
 
 
Service cost
$
0.1

 
$
0.1

Interest
5.0

 
5.0

Expected return on plan assets
(7.6
)
 
(7.7
)
Amortization of actuarial loss
1.3

 
0.3


(1.2
)
 
(2.3
)
Profit sharing
5.3

 
3.7

Multiemployer plan
0.6

 
—

Net retirement cost
$
4.7

 
$
1.4