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Changes in Stockholders' Equity (Schedule of Comprehensive Income (Loss) attributable to Noncontrolling Interests) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Stockholders' Equity Note [Abstract]    
Net income (loss) $ 0.0 $ (14.8)
Other comprehensive income:    
Foreign currency translation adjustments 0.0 0.8
Total comprehensive income (loss) $ 0.0 $ (14.0)