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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Summarized Activity of Stock Options

The following table summarizes activity for our stock options for the year ended December 31, 2020 (share data in thousands):

						Number of Shares						Weighted- Average Exercise Price						Weighted- Average Remaining Contractual Term						Aggregate Intrinsic Value (In millions)
Outstanding at beginning of period						324						$	23.91
Granted						—						N/A
Exercised						(123)						$	23.64
Cancelled/expired/forfeited						—						N/A
Outstanding at end of period						201						$	24.07					2.9 years						$	7.3
Exercisable at end of period						201						$	24.07					2.9 years						$	7.3

Schedule of Restricted Stock Units

Nonvested performance shares as of December 31, 2020 and changes during the year ended December 31, 2020 were as follows (share data in thousands):

						Number of Shares						Weighted- Average Grant Date Fair Value
Nonvested at beginning of period						409						$	53.39
Adjustment to assumed vesting percentage						76						$	52.86
Granted						146						$	56.75
Vested						(173)						$	48.76
Cancelled/forfeited						(7)						$	54.64
Nonvested at end of period						451						$	56.15

The actual number of shares in which each participant vests is dependent upon achievement of certain return on invested capital and diluted earnings per share targets over a three-year performance period. The number of shares in which participants can vest ranges from zero to 200% of the initial performance shares granted, to be determined upon completion of the three-year performance period. The nonvested shares at the end of the period in the table above assumes weighted-average vesting of 121%.

The actual tax benefits realized related to the performance shares vested during the year ended December 31, 2020 totaled $1.4 million.

Restricted Stock Units

Nonvested restricted stock units as of December 31, 2020 and changes during the year ended December 31, 2020 were as follows (share data in thousands):

						Number of Shares						Weighted- Average Grant Date Fair Value
Nonvested at beginning of period						166						$	54.51
Granted						120						$	56.70
Vested						(97)						$	54.45
Cancelled/forfeited						(4)						$	54.54
Nonvested at end of period						185						$	55.96

Schedule of Summarized Activity of Stock Appreciation

The following table summarizes activity for our stock appreciation rights for the year ended December 31, 2020 (unit data in thousands):

						Number of Units						Weighted- Average Exercise Price						Weighted- Average Remaining Contractual Term						Aggregate Intrinsic Value (In millions)
Outstanding at beginning of period						55						$	23.39
Granted						—						N/A
Exercised						(15)						$	21.69
Cancelled/expired/forfeited						—						N/A
Outstanding at end of period						40						$	24.04					2.9 years						$	1.4
Exercisable at end of period						40						$	24.04					2.9 years						$	1.4

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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