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Employee Stock and Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2021
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 31202120202019
Millions   
Performance Shares$2.0 $2.2 $2.3 
Restricted Stock Units1.0 0.9 0.8 
Total Share-Based Compensation Expense$3.0 $3.1 $3.1 
Income Tax Benefit$0.9 $0.9 $0.9 
Performance Shares [Table Text Block]
Performance Shares. The following table presents information regarding our non-vested performance shares.

 202120202019
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 185,284 $80.73 99,585 $72.78 129,693 $66.12 
Granted (a)
33,304 $73.25 25,763 $83.17 60,747 $63.89 
Awarded— — (25,304)$62.03 (75,943)$53.44 
Unearned Grant Award(33,375)$86.09 (13,625)$62.03 — — 
Forfeited(4,552)$74.05 (1,135)$79.81 (14,912)$77.14 
Non-vested as of December 3180,661 $75.80 85,284 $80.73 99,585 $72.78 
(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.

 202120202019
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 137,482 $77.64 39,943 $69.30 49,771 $60.74 
Granted (a)
16,251 $64.97 15,169 $83.48 13,927 $74.93 
Awarded(23,631)$74.53 (17,193)$63.41 (21,110)$52.44 
Forfeited(1,961)$74.52 (437)$77.52 (2,645)$72.43 
Available as of December 3128,141 $73.16 37,482 $77.64 39,943 $69.30 
(a)    Shares granted include accrued dividends.