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Earnings Per Common Share and Stockholders' Equity (Share Repurchase Program and Treasury Stock) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	17 Months Ended	18 Months Ended
	Mar. 31, 2022	Mar. 31, 2022	Apr. 30, 2022	Dec. 31, 2021	Nov. 19, 2021	Oct. 18, 2020
Equity, Class of Treasury Stock [Line Items]
Share repurchase program, authorized amount					$ 500.0	$ 500.0
Treasury stock acquired, shares	4,500,000	13,600,000
Treasury stock acquired, average price per common share		$ 32.73
Stock repurchase program, remaining authorized repurchase amount	$ 556.0	$ 556.0
Treasury stock, shares	14,326,518	14,326,518		9,936,715
Treasury stock, carrying value	$ 438.6	$ 438.6		$ 260.6
Subsequent Events
Equity, Class of Treasury Stock [Line Items]
Treasury stock acquired, shares			15,300,000
Treasury stock acquired, average price per common share			$ 33.43
Stock repurchase program, remaining authorized repurchase amount			$ 489.0

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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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