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Postretirement Benefit Plans
 9 Months Ended
Sep. 30, 2019
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Pension and Other Postretirement Benefits Disclosure [Text Block]
Note 15 - Other Postretirement Benefit Plans
The following table sets forth the net periodic benefit cost for the Company’s other postretirement benefit plans. The amounts for the three and nine months ended September 30, 2019 are based on calculations prepared by the Company's actuaries and represent the Company’s best estimate of the respective period’s proportionate share of the amounts to be recorded for the year ending December 31, 2019.
 
Three Months Ended
September 30,
Nine Months Ended
September 30,
 
2019
2018
2019
2018
Components of net periodic benefit cost:
 
 
 
 
Service cost
$
—

$
—

$
0.1

$
0.1

Interest cost
1.2

1.9

5.0

5.6

Expected return on plan assets
(0.8
)
(0.9
)
(2.4
)
(2.8
)
Amortization of prior service credit
(2.0
)
(0.4
)
(3.1
)
(1.2
)
Recognition of net actuarial losses
9.9

—

9.9

—

   Net periodic benefit cost
$
8.3

$
0.6

$
9.5

$
1.7


During July 2019, the Company announced changes to the medical plan offerings for certain of its postretirement benefit plans, effective January 1, 2020, which will impact the benefits provided to certain retirees. This plan amendment (1) resulted in a $103.5 million reduction in the postretirement benefit obligation and a corresponding pretax adjustment to accumulated other comprehensive loss; and (2) triggered a remeasurement of the postretirement benefit obligation, and as a result the Company recognized an actuarial loss of $9.9 million during the three months ended September 30, 2019. Starting with the three months ended September 30, 2019, the pretax adjustment of $103.5 million will be amortized from accumulated other comprehensive loss into net periodic benefit cost (as a benefit) over the next twelve years.