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Changes in Stockholders' Equity (Schedule of Comprehensive Income (Loss) attributable to Noncontrolling Interests) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Stockholders' Equity Note [Abstract]        
Net income (loss) $ 0.0 $ (0.1) $ 0.0 $ (14.9)
Other comprehensive income:        
Foreign currency translation adjustments 0.0 0.1 0.0 0.9
Total comprehensive income (loss) $ 0.0 $ 0.0 $ 0.0 $ (14.0)