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Employee Benefits (Tables)
 6 Months Ended
Jun. 30, 2017
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,
 
2017
 
2016
 
2017
 
2016
Pension Plan and SERP benefits
(in millions)
Service cost
$
0.1

 
$
0.4

 
$
0.4

 
$
0.6

Interest cost
1.2

 
1.4

 
2.4

 
2.6

Expected return on plan assets
(1.4
)
 
(1.4
)
 
(2.7
)
 
(2.8
)
Amortization of prior service costs(1)
0.3

 
0.4

 
0.6

 
0.6

Amortization of actuarial losses(1)
(0.1
)
 
0.3

 
0.2

 
0.4

Periodic expense
$
0.1

 
$
1.1

 
$
0.9

 
$
1.4

 
 
 
 
 
 
 
 
Medical Plan benefits
 
 
 
 
 
 
 
Interest cost
$
0.1

 
$
—

 
$
0.1

 
$
0.1

Amortization of prior service costs(1)
—

 
0.1

 
(0.1
)
 
0.1

Periodic expense
$
0.1

 
$
0.1

 
$
—

 
$
0.2


____________________________
(1) 
Amortization of prior service costs out of accumulated other comprehensive income are recognized on the Condensed Consolidated Statements of Operations within "Interest and other income (expense)".