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Earnings (Loss) Per Common Share and Stockholders' Equity (Share Repurchase Program and Treasury Stock) (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended	20 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Nov. 19, 2021	Oct. 18, 2020
Earnings Per Share [Abstract]
Share repurchase program, authorized amount				$ 500.0	$ 500.0
Treasury stock acquired, shares	9,400,000	18,500,000
Treasury stock acquired, average price per common share		$ 34.20
Stock repurchase program, remaining authorized repurchase amount	$ 367.0	$ 367.0
Treasury stock, shares	19,220,002	19,220,002	9,936,715
Treasury stock, carrying value	$ 607.1	$ 607.1	$ 260.6

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Amount of stock repurchase plan authorized.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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