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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [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
 
March 31,
 
2019
 
2018
Pension Plan and SERP benefits
(in millions)
Service cost
$
0.1

 
$
0.2

Interest cost
1.2

 
1.1

Expected return on plan assets
(1.5
)
 
(1.4
)
Amortization of prior service costs(1)
0.1

 
0.2

Amortization of actuarial losses(1)
0.1

 
0.3

Curtailment (gain) loss(2)
0.3

 
—

Periodic expense
$
0.3

 
$
0.4

 
 
 
 
Medical Plan benefits
 
 
 
Amortization of prior service costs(1)
$
—

 
$
(0.1
)
Curtailment (gain) loss(2)
(0.8
)
 
—

Periodic expense
$
(0.8
)
 
$
(0.1
)

____________________________
(1) 
Amortization of prior service costs and actuarial losses out of accumulated other comprehensive income (loss) are recognized on the Condensed Consolidated Statements of Operations within "Interest and other income (expense)".
(2) 
A curtailment is recognized when there is a significant reduction in, or an elimination of, defined benefit accruals for current employees' future services. The net curtailment gain between the SERP and Medical Plan of $0.5 million is related to the Haynesville Divestiture. Of the $0.5 million curtailment gain recognized, $0.3 million was recognized on the Condensed Consolidated Statements of Operations within "Interest and other income (expense)" and $0.2 million was recognized on the Condensed Consolidated Statements of Operations within "Net gain (loss) from asset sales, inclusive of restructuring costs" for the three months ended March 31, 2019.