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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Principal weighted average assumptions used in applying the Black-Scholes model were as follows:

A summary of stock option award activity as of and for the year ended December 31, 2021 is presented below:


Stock Options	Awards (in millions)	Weighted- Average Exercise Price		Aggregate Intrinsic Value (in millions)		Weighted Average Remaining Contractual Life (years)
Outstanding at January 1, 2021	2.5	$	27.34
Granted	—	$	—
Exercised	(0.6)	$	27.12
Forfeited	(0.5)	$	30.55
Outstanding at December 31, 2021	1.4	$	26.30
Vested and expected to vest at December 31, 2021	1.4	$	26.30	$	9.5	5.2
Exercisable at December 31, 2021	1.2	$	26.23	$	8.5	5.0

A summary of restricted stock and restricted stock unit award activity as of and for the year ended December 31, 2021 is presented below:


Restricted Stock Awards and Restricted Stock Units (1)	Awards/Units (in millions)	Weighted-Average Fair Value
Outstanding at January 1, 2021	1.0	$	28.84
Granted	0.7	$	28.95
Vested	(0.5)	$	28.99
Forfeited	(0.1)	$	28.58
Outstanding at December 31, 2021	1.1	$	28.85

(1) As of December 31, 2021, there are no restricted stock awards outstanding and only restricted stock units remain.

A summary of PSA and PSU activity as of and for the year ended December 31, 2021 is presented below:


Performance Stock Awards and Performance Share Units (1)	Awards (in millions)	Weighted-Average Fair Value
Outstanding at January 1, 2021	0.5	$	31.07
Granted	0.4	$	29.53
Vested	—	$	—
Forfeited	(0.1)	$	31.79
Outstanding at December 31, 2021	0.8	$	30.10

(1) As of December 31, 2021, there are no performance stock awards outstanding and only performance share units remain.