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Shareholders' Equity Cash Dividend Restrictions (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
C Cash Dividend Restrictions [Abstract]      
Amount available for dividend distribution without prior approval from regulatory agency $ 982.0    
Dividends declared to the Company by it subsidiaries 566.7 $ 472.4 $ 399.5
Extra-ordinary dividends received from subsidiaries $ 100.0 $ 37.7