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Capital Stock (Shares Repurchased) (Details) - USD ($)
$ in Millions
202 Months Ended
Mar. 31, 2024
Feb. 02, 2016
Feb. 01, 2016
Equity, Class of Treasury Stock [Line Items]      
Share repurchase plan, authorized amount   $ 468.0 $ 300.0
Common shares repurchased, value $ 288.1    
Share repurchase plan, remaining capacity $ 179.9