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SHARE-BASED AWARDS (Tables)

12 Months Ended

Dec. 31, 2021

SHARE-BASED AWARDS

Summary of Compensation Expense and Other Information Related to Share-Based awards

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​	​	​	​	​	​	​	​	​	​	​
​	​	Years Ended December 31,
Share-based compensation expense, net of estimated forfeitures (in millions)		2021			2020			2019
Share-based compensation expense	​	$	19.3	​	$	18.8	​	$	11.3	​
Intrinsic value of options exercised	​	$	—	​	$	5.8	​	$	0.5	​
Tax benefit realized upon stock vesting	​	$	8.0	​	$	3.3	​	$	2.0	​
Fair value of stock vested	​	$	33.5	​	$	13.1	​	$	8.2	​

Non-Vested Restricted Stock Unit Activity

The following table summarizes non-vested restricted stock unit activity through December 31, 2021 (in thousands, except weighted average grant-date fair value amounts):

​	​	​	​	​	​	​	​	​	​	​
​		2007 Plan		2016 Plan		Total		Weighted
​	​	Restricted	​	Restricted	​	Restricted	​	Average Grant-		​
​	​	Stock Units	​	Stock Units	​	Stock Units	​	Date Fair Value
Outstanding at December 31, 2020		3		789		792	​	$	35.14	​
Granted	​	—	​	239	​	239	​	​	68.41	​
Vested	​	(2)	​	(507)	​	(509)	​	​	32.54	​
Canceled	​	—	​	(3)	​	(3)	​	​	44.27	​
Added by performance factor (1)	​	—	​	172	​	172	​	​	31.48	​
Outstanding at December 31, 2021		1		690		691	​	$	47.61	​

(1) Represents shares paid out above target.

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- Definition

Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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