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Schedule II - Condensed Balance Sheets Parent Company (Parenthetical) (Detail) - $ / shares
shares in Millions
Dec. 31, 2021
Dec. 31, 2020
Condensed Balance Sheet Statements Captions [Line Items]    
Preferred stock, par value $ 0.00001 $ 0.00001
Preferred stock, shares authorized 0.5 0.5
Preferred stock, outstanding 0.0 0.0
Common stock, par value $ 0.00001 $ 0.00001
Common stock, shares authorized 300.0 300.0
Common stock, shares outstanding 109.7 110.4
Parent Company    
Condensed Balance Sheet Statements Captions [Line Items]    
Preferred stock, par value $ 0.00001 $ 0.00001
Preferred stock, shares authorized 0.5 0.5
Preferred stock, outstanding 0.0 0.0
Common stock, par value $ 0.00001 $ 0.00001
Common stock, shares authorized 300.0 300.0
Common stock, shares outstanding 109.7 110.4