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Employee Stock and Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Share-Based Compensation Expense [Table Text Block]
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 31202220212020
Millions   
Performance Shares$0.7 $2.0 $2.2 
Restricted Stock Units0.9 1.0 0.9 
Total Share-Based Compensation Expense$1.6 $3.0 $3.1 
Income Tax Benefit$0.5 $0.9 $0.9 
Performance Shares [Table Text Block]
Performance Shares. The following table presents information regarding our non-vested performance shares.

 202220212020
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 180,661 $75.80 85,284 $80.73 99,585 $72.78 
Granted (a)
37,731 $67.22 33,304 $73.25 25,763 $83.17 
Awarded— — — — (25,304)$62.03 
Unearned Grant Award(50,524)$77.49 (33,375)$86.09 (13,625)$62.03 
Forfeited(7,379)$71.00 (4,552)$74.05 (1,135)$79.81 
Non-vested as of December 3160,489 $69.62 80,661 $75.80 85,284 $80.73 
(a)    Shares granted include accrued dividends.
Restricted Stock Units [Table Text Block]
Restricted Stock Units. The following table presents information regarding our available restricted stock units.

 202220212020
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 128,141 $73.16 37,482 $77.64 39,943 $69.30 
Granted (a)
15,477 $63.70 16,251 $64.97 15,169 $83.48 
Awarded(7,396)$75.55 (23,631)$74.53 (17,193)$63.41 
Forfeited(2,658)$66.44 (1,961)$74.52 (437)$77.52 
Available as of December 3133,564 $68.80 28,141 $73.16 37,482 $77.64 
(a)    Shares granted include accrued dividends.