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Employee Benefits (Tables)
 6 Months Ended
Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Pension and Other Postretirement Benefit Costs
 
Pension
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2014
 
2013
 
2014
 
2013
 
(in millions)
Service cost
$
0.7

 
$
0.9

 
$
1.4

 
$
1.9

Interest cost
1.4

 
1.3

 
2.8

 
2.5

Expected return on plan assets
(1.2
)
 
(1.0
)
 
(2.4
)
 
(2.0
)
Amortization of prior service costs (1)
1.2

 
1.3

 
2.5

 
2.5

Amortization of actuarial losses (1)
0.2

 
0.6

 
0.4

 
1.2

Curtailment cost
2.0

 
—

 
2.0

 
—

Special termination benefits
0.3

 
—

 
0.3

 
—

Periodic expense
$
4.6

 
$
3.1

 
$
7.0

 
$
6.1

 ____________________________
(1) 
Amortization of prior service costs and actuarial losses out of AOCI are recognized in the Condensed Consolidated Statements of Operations in "General and administrative."



 
Postretirement Benefits
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2014
 
2013
 
2014
 
2013
 
(in millions)
Interest cost
$
0.1

 
$
0.1

 
$
0.2

 
$
0.2

Amortization of prior service costs (1)
0.1

 
0.1

 
0.2

 
0.2

Curtailment cost
0.4

 
—

 
0.4

 
—

Periodic expense
$
0.6

 
$
0.2

 
$
0.8

 
$
0.4

____________________________
(1) 
Amortization of prior service costs out of AOCI are recognized in the Condensed Consolidated Statements of Operations in "General and administrative."