Common Stock and Stock-Based Compensation Share Repurchases (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Share Repurchases [Table Text Block]

Share repurchase activity under this program is as follows:

	Shares Repurchased			Remaining Authorization to Repurchase
Period	Number of shares	Cost (in millions)		Cost (in millions)
March 7, 2019 Authorization				$	350.0
March 7, 2019 through March 31, 2019	866,715	$	19.0	$	331.0
April 1, 2019 through June 30, 2019	2,133,116	44.0		$	287.0
July 1, 2019 through September 30, 2019	5,171,489	100.9		$	186.1
October 1, 2019 through December 31, 2019	2,933,474	60.8		$	125.3
January 1, 2020 through March 31, 2020	1,850,000	35.4		$	89.9
April 1, 2020 through June 30, 2020	—	—		$	89.9
July 1, 2020 through September 30, 2020	4,466,896	89.9		$	—
Total	17,421,690	$	350.0