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Employee Benefit Plans: (Tables)
 6 Months Ended
Jun. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Pension And Other Postretirement Benefits, Net Periodic Benefit Costs, Disclosure
The components of pension benefit (income) expense, including provision for executive retirement agreements, were as follows:
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(Millions)
 
2020

 
2019

 
2020

 
2019

Benefits earned during the period (a)
 
$
1.0

 
$
0.9

 
$
2.0

 
$
1.5

Interest cost on benefit obligation (b)
 
9.4

 
11.1

 
18.8

 
22.0

Net actuarial loss (b)
 
2.9

 
7.7

 
2.9

 
7.7

Amortization of prior service credit (b)
 
(0.2
)
 
(0.2
)
 
(0.4
)
 
(0.5
)
Expected return on plan assets (b)
 
(14.6
)
 
(12.4
)
 
(29.3
)
 
(24.8
)
Net periodic benefit (income) expense
 
$
(1.5
)
 
$
7.1

 
$
(6.0
)
 
$
5.9


(a)
Included in cost of services and selling, general and administrative expense.

(b)
Included in other income (expense), net.