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Employee Benefits (Tables)
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
The following table sets forth the Company’s net periodic benefit costs related to its Pension Plan, SERP and Medical Plan:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2016
 
2015
 
2016
 
2015
Pension Plan and SERP benefits
(in millions)
Service cost
$
0.4

 
$
0.4

 
$
0.6

 
$
1.0

Interest cost
1.4

 
1.1

 
2.6

 
2.4

Expected return on plan assets
(1.4
)
 
(1.4
)
 
(2.8
)
 
(2.8
)
Amortization of prior service costs (1)
0.3

 
0.1

 
0.4

 
0.9

Amortization of actuarial losses (1)
0.4

 
—

 
0.6

 
0.3

Curtailment loss (2)
—

 
11.2

 
—

 
11.2

Periodic expense
$
1.1

 
$
11.4

 
$
1.4

 
$
13.0

 
 
 
 
 
 
 
 
Medical Plan benefits
 
 
 
 
 
 
 
Interest cost
$
—

 
$
—

 
$
0.1

 
$
0.1

Amortization of prior service costs (1)
0.1

 
0.1

 
0.1

 
0.1

Periodic expense
$
0.1

 
$
0.1

 
$
0.2

 
$
0.2


____________________________
(1) 
Amortization of prior service costs and actuarial losses out of accumulated other comprehensive income are recognized in the Condensed Consolidated Statements of Operations within "General and administrative" expense.
(2) 
A curtailment is recognized immediately when there is a significant reduction in, or an elimination of, defined benefit accruals for current employees' future services. These expenses are included on the Condensed Consolidated Statements of Operations within "General and administrative" expense for the three and six months ended June 30, 2015