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Employee Benefits (Tables)
 9 Months Ended
Sep. 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
 
Nine Months Ended
 
September 30,
 
September 30,
 
2017
 
2016
 
2017
 
2016
Pension Plan and SERP benefits
(in millions)
Service cost
$
0.2

 
$
0.3

 
$
0.6

 
$
0.9

Interest cost
1.2

 
1.3

 
3.6

 
3.9

Expected return on plan assets
(1.3
)
 
(1.4
)
 
(4.0
)
 
(4.2
)
Amortization of prior service costs(1)
0.3

 
0.3

 
0.9

 
0.9

Amortization of actuarial losses(1)
0.1

 
0.2

 
0.3

 
0.6

Curtailment loss(2)
0.7

 
—

 
0.7

 
—

Periodic expense
$
1.2

 
$
0.7

 
$
2.1

 
$
2.1

 
 
 
 
 
 
 
 
Medical Plan benefits
 
 
 
 
 
 
 
Interest cost
$
—

 
$
0.1

 
$
0.1

 
$
0.2

Amortization of prior service costs(1)
(0.1
)
 
—

 
(0.2
)
 
0.1

Periodic expense
$
(0.1
)
 
$
0.1

 
$
(0.1
)
 
$
0.3


____________________________
(1) 
Amortization of prior service costs and actuarial losses out of accumulated other comprehensive income are recognized on the Condensed Consolidated Statements of Operations within "Interest and other income (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 relate to the Pinedale Divestiture and are recognized on the Condensed Consolidated Statements of Operations within "Gain (loss) from asset sales" for the three and nine months ended September 30, 2017.