Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Stockholders' Equity

Summary of share repurchases

The table below summarizes the Company’s share repurchases beginning January 1, 2016 under its Board of Directors’ authorizations:

		Amount		Shares
		Authorized	Total	Remaining	Shares Repurchased
		by Board	Shares	Under Board	Under Board
	Expiration	(Shares in	Repurchased	Authorization	Authorization
RepurchaseProgram Authorization Date	Date	millions)	(millions)	(millions)	2018		2017		2016
October 2014	none	4.0	3.7	0.3		0.3		0.9		1.3
February 2018	none	4.0	—	4.0		—		—		—
Total shares repurchased under authorization						0.3		0.9		1.3
Cost (millions)					$	5.8	$	16.9	$	22.1
Average share price					$	20.28	$	19.13	$	16.55