Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Schedule of Stock Option Activity

Information related to stock options issued to officers, other employees and directors under all plans is presented in the following table:

	2019			2018			2017
	Shares	Weighted Average Exercise Price		Shares	Weighted Average Exercise Price		Shares	Weighted Average Exercise Price
Number of shares under option:
Outstanding — beginning of year	114,943	$	48.63	114,943	$	48.63	—	$	—
Granted	—	—		—	—		114,943	48.63
Exercised	—	—		—	—		—	—
Canceled	—	—		—	—		—	—
Outstanding — end of year	114,943	$	48.63	114,943	$	48.63	114,943	$	48.63
Exercisable — end of year	—	$	—	—	$	—	—	$	—

Schedule of Stock-Based Compensation

We recorded stock-based compensation for Restricted Shares as follows:

	Year Ended December 31,
	2019			2018			2017
	(Amounts in millions)
Stock-based compensation expense	$	23.9		$	19.9		$	22.8
Related income tax benefit	(5.4		)	(4.5		)	(5.2		)
Net stock-based compensation expense	$	18.5		$	15.4		$	17.6

Information Regarding Restricted Shares

The following table summarizes information regarding Restricted Shares:

	Year Ended December 31, 2019
	Shares		Weighted Average Grant-Date Fair Value
Number of unvested Restricted Shares:
Outstanding — beginning of year	1,530,214		$	45.06
Granted	857,116		46.80
Vested	(392,152	)	42.82
Canceled	(304,578	)	43.66
Outstanding — ending of year	1,690,600		$	46.71