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Pension and Other Postretirement Benefit Plans
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefit Plans [Text Block] PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS
 
Pension
 
Other
Postretirement
Components of Net Periodic Benefit Cost
2018
 
2017
 
2018
 
2017
Millions
 
 
 
 
 
 
 
Quarter Ended September 30,
 
 
 
 
 
 
 
Service Cost

$2.7

 

$2.6

 

$1.2

 

$1.1

Non-Service Cost Components (a)
 
 
 
 
 
 
 
Interest Cost
7.4

 
8.1

 
1.8

 
2.0

Expected Return on Plan Assets
(11.1
)
 
(10.6
)
 
(2.7
)
 
(2.6
)
Amortization of Prior Service Credits
—

 
—

 
(0.4
)
 
(0.5
)
Amortization of Net Loss
3.0

 
2.5

 
0.2

 
—

Net Periodic Benefit Cost

$2.0

 

$2.6

 

$0.1

 
—

 
 
 
 
 
 
 
 
Nine Months Ended September 30,
 
 
 
 
 
 
 
Service Cost

$8.2

 

$7.7

 

$3.7

 

$3.3

Non-Service Cost Components (a)
 
 
 
 
 
 
 
Interest Cost
22.2

 
24.4

 
5.4

 
5.8

Expected Return on Plan Assets
(33.2
)
 
(31.8
)
 
(8.2
)
 
(7.9
)
Amortization of Prior Service Credits
—

 
—

 
(1.3
)
 
(1.5
)
Amortization of Net Loss
9.0

 
7.4

 
0.6

 
0.2

Net Periodic Benefit Cost (Income)

$6.2

 

$7.7

 

$0.2

 
$(0.1)

(a)
These components of net periodic benefit cost are included in the line item “Other” under Other Income (Expense) on the Consolidated Statement of Income.
NOTE 12. PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Continued)

Employer Contributions. For the nine months ended September 30, 2018, we contributed $15.0 million in cash to the defined benefit pension plans ($1.7 million in cash and $13.5 million in ALLETE common stock for the nine months ended September 30, 2017); we do not expect to make additional contributions to our defined benefit pension plans in 2018. For the nine months ended September 30, 2018, and 2017, we made no contributions to our other postretirement benefit plans; we do not expect to make any contributions to our other postretirement benefit plans in 2018.