XML 111 R97.htm IDEA: XBRL DOCUMENT v3.24.0.1
Note 18 - Pension and Postretirement Benefits - Summary of Changes in Benefit Obligations and Plan Assets Amount Recognized (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair value of plan assets at January 1 $ 414.2    
Fair value of plan assets at December 31 434.0 $ 414.2  
Pension Plan and SERP Plan [Member]      
Benefit obligation 330.9 431.7  
Interest cost 17.1 14.7 $ 11.0
Actuarial (gain) loss (0.8) (86.6)  
Plan participants’ contributions 0.0 0.0  
Benefits paid (29.4) (28.9)  
Benefit obligation 317.8 330.9 431.7
Accumulated benefit obligation at December 31 317.8 330.9  
Fair value of plan assets at January 1 406.3 546.2  
Actuarial gain (loss) 47.3 (111.8)  
Employer contributions, net 1.7 0.8  
Plan participants’ contributions 0.0 0.0  
Benefits paid (29.4) (28.9)  
Fair value of plan assets at December 31 425.9 406.3 546.2
Funded status at December 31 (108.1) (75.4)  
Pension assets, noncurrent (1) [1] (117.4) (85.6)  
Pension, SERP and postretirement benefits, current (2) [2] 1.0 0.8  
Pension, SERP and postretirement benefits, noncurrent (3) [3] 8.3 9.4  
Total Pension, SERP and Postretirement benefits (108.1) (75.4)  
Other Postretirement Benefits Plan [Member]      
Benefit obligation 4.2 6.0  
Interest cost 0.2 0.1 0.1
Actuarial (gain) loss 1.1 (0.4)  
Plan participants’ contributions 1.3 1.3  
Benefits paid (2.7) (2.8)  
Benefit obligation 4.1 4.2 6.0
Accumulated benefit obligation at December 31  
Fair value of plan assets at January 1 7.6 9.5  
Actuarial gain (loss) 0.4 (1.1)  
Employer contributions, net 1.5 0.7  
Plan participants’ contributions 1.3 1.3  
Benefits paid (2.7) (2.8)  
Fair value of plan assets at December 31 8.1 7.6 $ 9.5
Funded status at December 31 (4.0) (3.4)  
Pension assets, noncurrent (1) [1] (4.0) (3.4)  
Pension, SERP and postretirement benefits, current (2) [2] 0.0 0.0  
Pension, SERP and postretirement benefits, noncurrent (3) [3] 0.0 0.0  
Total Pension, SERP and Postretirement benefits $ (4.0) $ (3.4)  
[1] Included in "Other noncurrent assets" in our accompanying consolidated balance sheets
[2] Included in "Accounts payable and accrued liabilities" in our accompanying consolidated balance sheets
[3] Included in "Other noncurrent liabilities" in our accompanying consolidated balance sheets