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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Stock-Based Compensation [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
The following table summarizes the Company's pre-tax compensation expense and related income tax benefit for the years ended December 31, 2019, 2018 and 2017 related to the Company's performance units and restricted stock units.
Year Ended December 31 (In millions)
201920182017
Performance units:   
Total shareholder return$8.7  $8.2  $7.6  
Earnings per share4.3  5.1  1.4  
Total performance units13.0  13.3  9.0  
Restricted stock units0.9  0.1  0.1  
Total compensation expense$13.9  $13.4  $9.1  
Income tax benefit$3.6  $3.4  $3.5  
Performance Units Total Shareholder Return Valuation Assumptions [Table Text Block] The number of performance units granted based on total shareholder return and the assumptions used to calculate the grant date fair value of the performance units based on total shareholder return are shown in the following table.
 201920182017
Number of units granted208,647  261,916  260,570  
Fair value of units granted$47.00  $36.86  $41.77  
Expected dividend yield4.0 %3.6 %3.8 %
Expected price volatility17.0 %19.0 %19.9 %
Risk-free interest rate2.47 %2.38 %1.44 %
Expected life of units (in years)
2.862.862.80
Performance Units Earnings Per Share Valuation Assumptions [Table Text Block] In 2019, the Compensation Committee of the Company's Board of Directors voted to grant restricted stock units in lieu of performance units based on earnings per share. For 2018 and 2017, the number of performance units granted based on earnings per share and the grant date fair value are shown in the following table. 
20182017
Number of units granted87,308  86,857  
Fair value of units granted$31.03  $34.83  
Restricted Stock Valuation Assumptions [Table Text Block] The number of restricted stock units granted and the grant date fair value are shown in the following table. 
 201920182017
Restricted stock units granted75,929  826  3,145  
Fair value of restricted stock units granted$41.71  $36.28  $34.96  
Share-based Compensation, Activity [Table Text Block]
A summary of the activity for the Company's performance units and restricted stock units at December 31, 2019 and changes in 2019 are shown in the following table.
Performance UnitsRestricted
Stock Units
Total Shareholder ReturnEarnings Per Share
(Dollars in millions)Number
of Units		Aggregate Intrinsic ValueNumber
of Units		Aggregate Intrinsic ValueNumber
of Shares		Aggregate Intrinsic Value
Units/shares outstanding at 12/31/18755,480  251,825  2,711  
Granted208,647  (A) —  75,929  
Converted(274,078) (B) $19.8  (91,356) (B) $7.2  N/A  
VestedN/A  N/A  (2,161) $0.1  
Forfeited(25,232) (5,298) (3,599) 
Units/shares outstanding at 12/31/19664,817  $35.4  155,171  $11.5  72,880  $3.2  
Units/shares fully vested at 12/31/19222,163  $11.5  74,053  $6.6  
(A)For performance units, this represents the target number of performance units granted. Actual number of performance units earned, if any, is dependent upon performance and may range from zero percent to 200 percent of the target.
(B)These amounts represent performance units that vested at December 31, 2018 which were settled in February 2019.
Schedule of Nonvested Share Activity [Table Text Block]
A summary of the activity for the Company's non-vested performance units and restricted stock units at December 31, 2019 and changes in 2019 are shown in the following table.
Performance UnitsRestricted
Stock Units
Total Shareholder ReturnEarnings Per Share
Number
of Units		Weighted-Average
Grant Date
Fair Value		Number
of Units		Weighted-Average
Grant Date
Fair Value		Number
of Shares		Weighted-Average
Grant Date
Fair Value
Units/shares non-vested at 12/31/18481,402  $39.17  160,469  $32.82  2,711  $35.00  
Granted208,647  (A) $47.00  —  $—  75,929  $41.71  
Vested(222,163) $41.76  (74,053) $34.83  (2,161) $34.66  
Forfeited(25,232) $41.45  (5,298) $32.07  (3,599) $41.78  
Units/shares non-vested at 12/31/19442,654  $41.43  81,118  $31.03  72,880  $41.66  
Units/shares expected to vest418,331  (B) 77,617  (B) 54,102  (B) 
(A)For performance units, this represents the target number of performance units granted. Actual number of performance units earned, if any, is dependent upon performance and may range from zero percent to 200 percent of the target.
(B)The intrinsic value of the performance units based on total shareholder return and earnings per share is $22.8 million and $4.7 million, respectively. The intrinsic value of restricted stock units is $2.4 million.
Fair Value of Vested Performance Units and Restricted Stock [Table Text Block]
A summary of the Company's fair value for its vested performance units and restricted stock units is shown in the following table.
Year Ended December 31 (In millions)
201920182017
Performance units:
Total shareholder return$9.3  $5.9  $6.3  
Earnings per share$5.2  $4.9  $1.2  
Restricted stock units$0.1  $0.1  $0.1  
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]
A summary of the Company's unrecognized compensation cost for its non-vested performance units and restricted stock units and the weighted-average periods over which the compensation cost is expected to be recognized are shown in the following table.
December 31, 2019
Unrecognized Compensation Cost (In millions)
Weighted Average to be Recognized (In years)
Performance units:
Total shareholder return$8.7  1.67
Earnings per share0.8  1.00
Total performance units9.5  
Restricted stock units1.5  1.98
Total unrecognized compensation cost$11.0