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Common Stock and Stock-Based Compensation Stock Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share Repurchases [Table Text Block] Share repurchase activity under the authorized program is as follows:
Shares RepurchasedRemaining Authorization to Repurchase
PeriodNumber of SharesCost
(in millions)		Cost
(in millions)
September 9, 2021 Authorization$250.0 
September 9, 2021 through September 30, 2021— $— $250.0 
October 1, 2021 through December 31, 20215,155,491 151.9 $98.1 
January 1, 2022 through March 31, 2022— — $98.1 
April 1, 2022 through June 30, 20221,760,462 50.3 $47.8 (1)
Total6,915,953 $202.2 
(1) Share repurchases during the second quarter of 2022 included 760,602 shares at a cost of $25.0 million representing the final settlement of the ASR, which was funded in December 2021 but a portion of which remained outstanding as of December 31, 2021.
Share-based Payment Arrangement, Activity [Table Text Block]
The following table summarizes stock-based compensation awards granted during the six months ended June 30, 2022:
Number of Shares GrantedWeighted Average Grant-Date Fair Value per Award
Restricted stock units609,736 $25.68 
Restricted stock awards22,730 $25.63 
Performance units242,519 $29.90