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Employee Stock and Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Share-Based Compensation Expense
The following share-based compensation expense amounts were recognized in our Consolidated Statement of Income for the periods presented.

Share-Based Compensation Expense
Year Ended December 31202320222021
Millions   
Performance Shares$3.1 $0.7 $2.0 
Restricted Stock Units0.8 0.9 1.0 
Total Share-Based Compensation Expense$3.9 $1.6 $3.0 
Income Tax Benefit$1.1 $0.5 $0.9 
Performance Shares
Performance Shares. The following table presents information regarding our non-vested performance shares.

 202320222021
Number of
Shares		Weighted-
Average
Grant Date
Fair Value		Number of
Shares		Weighted-
Average
Grant Date
Fair Value		Number of
Shares		Weighted-
Average
Grant Date
Fair Value
Non-vested as of January 160,489 $69.62 80,661 $75.80 85,284 $80.73 
Granted (a)
54,039 $63.50 37,731 $67.22 33,304 $73.25 
Awarded— — — — — — 
Unearned Grant Award— — (50,524)$77.49 (33,375)$86.09 
Forfeited(3,030)$67.60 (7,379)$71.00 (4,552)$74.05 
Non-vested as of December 31111,498 $66.71 60,489 $69.62 80,661 $75.80 
(a)    Shares granted include accrued dividends.
Restricted Stock Units
Restricted Stock Units. The following table presents information regarding our available restricted stock units.

 202320222021
Number of
Shares		Weighted- Average
Grant Date
Fair Value		Number of
Shares		Weighted- Average
Grant Date
Fair Value		Number of
Shares		Weighted- Average
Grant Date
Fair Value
Available as of January 133,564 $68.80 28,141 $73.16 37,482 $77.64 
Granted (a)
21,200 $61.16 15,477 $63.70 16,251 $64.97 
Awarded(9,631)$81.91 (7,396)$75.55 (23,631)$74.53 
Forfeited(1,389)$63.46 (2,658)$66.44 (1,961)$74.52 
Available as of December 3143,744 $62.38 33,564 $68.80 28,141 $73.16 
(a)    Shares granted include accrued dividends.