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Employee Stock and Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2020
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 31202020192018
Millions   
Performance Shares$2.2 $2.3 $2.3 
Restricted Stock Units0.9 0.8 0.9 
Total Share-Based Compensation Expense$3.1 $3.1 $3.2 
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.
 202020192018
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 199,585 $72.78 129,693 $66.12 127,898 $58.23 
Granted (a)
25,763 $83.17 60,747 $63.89 66,557 $76.42 
Awarded(25,304)$62.03(75,943)$53.44 (58,293)$59.82 
Unearned Grant Award(13,625)$62.03 — — — — 
Forfeited(1,135)$79.81 (14,912)$77.14 (6,469)$72.99 
Non-vested as of December 3185,284 $80.73 99,585 $72.78 129,693 $66.12 
(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.
 202020192018
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 139,943 $69.30 49,771 $60.74 55,248 $56.18 
Granted (a)
15,169 $83.48 13,927 $74.93 16,573 $71.11 
Awarded(17,193)$63.41 (21,110)$52.44 (18,881)$55.78 
Forfeited(437)$77.52 (2,645)$72.43 (3,169)$64.92 
Available as of December 3137,482 $77.64 39,943 $69.30 49,771 $60.74 
(a)    Shares granted include accrued dividends.