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SHARE-BASED AWARDS (Tables)

12 Months Ended

Dec. 31, 2019

SHARE-BASED AWARDS

Summary of Compensation expense and Other Measures Related to Share-Based awards

​

​	​	​	​	​	​	​	​	​	​	​
​	​	Years Ended December 31,
Share-based compensation expense, net of estimated forfeitures (in millions)		2019			2018			2017
Share-based compensation expense	​	$	11.3	​	$	12.1	​	$	11.1	​
Intrinsic value of options exercised	​	$	0.5	​	$	0.5	​	$	0.7	​
Tax benefit realized upon stock vesting	​	$	2.0	​	$	2.7	​	$	6.8	​
Fair value of stock vested	​	$	8.2	​	$	10.8	​	$	17.3	​

Stock Option Activity

Stock option activity for the year ended December 31, 2019 was as follows (in thousands, except weighted average exercise price and weighted average contractual life):

​	​	​	​	​	​	​	​	​	​	​	​
​				Weighted			Weighted			​
​	​	​	​	Average		​	Average	​	Aggregate
​	​	2007 Plan	​	Exercise		​	Contractual	​	Intrinsic
​	​	Shares	​	Price		​	Life	​	Value
Outstanding at December 31, 2018		196		$	21.81	​	​	​	​	​	​
Exercised		(23)	​	$	18.12	​	​	​	​	​	​
Outstanding at December 31, 2019		173		$	22.30		1.7	​	$	3,203	​
Exercisable at December 31, 2019		173		$	22.30		1.7	​	$	3,203	​

Non-Vested Restricted Stock Unit Activity

The following table summarizes non-vested restricted stock unit activity through December 31, 2019 (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, 2018		164		595		759	​	$	33.92	​
Granted	​	—	​	363	​	363	​	$	33.65	​
Settlement of Performance Shares (1)	​	(66)	​	—	​	(66)	​	$	37.68	​
Vested	​	(90)	​	(150)	​	(240)	​	$	34.36	​
Canceled	​	—	​	(38)	​	(38)	​	$	33.17	​
Outstanding at December 31, 2019		8		770		778	​	$	33.39	​

(1) Represents 2016 Performance Shares paid out below target.

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

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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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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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