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Employee Benefits (Tables)
 6 Months Ended
Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Schedule of (Income) Charges Related to Benefit Plans
The following table presents the components of net periodic pension benefit income for the VEBAs and charges relating to all other employee benefit plans for the quarter and six months ended June 30, 2014 and June 30, 2013:
 
Quarter Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2014
 
2013
 
2014
 
2013
VEBAs:
 
 
 
 
 
 
 
Service cost
$
0.5

 
$
0.7

 
$
1.1

 
$
1.3

Interest cost
4.2

 
3.7

 
8.3

 
7.3

Expected return on plan assets
(12.8
)
 
(11.5
)
 
(25.6
)
 
(22.7
)
Amortization of prior service cost
2.6

 
1.0

 
5.4

 
2.1

Amortization of net actuarial (gain) loss
(0.6
)
 
0.4

 
(0.9
)
 
0.7

Total net periodic pension benefit (income) expense relating to VEBAs
(6.1
)
 
(5.7
)
 
(11.7
)
 
(11.3
)
Deferred compensation plan
0.4

 
—

 
0.6

 
0.4

Defined contribution plans
1.5

 
1.3

 
5.5

 
5.3

Multiemployer pension plans
0.9

 
0.9

 
1.8

 
1.7

Total
$
(3.3
)
 
$
(3.5
)
 
$
(3.8
)
 
$
(3.9
)
Allocation of (Income) Charges Relating to Benefit Plans by Segment
(see Note 11):
 
Quarter Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2014
 
2013
 
2014
 
2013
Fabricated Products
$
2.3

 
$
2.0

 
$
6.9

 
$
6.6

All Other
(5.6
)
 
(5.5
)
 
(10.7
)
 
(10.5
)
Total
$
(3.3
)
 
$
(3.5
)
 
$
(3.8
)
 
$
(3.9
)