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Changes in Stockholders' Equity (Schedule of Comprehensive Income (Loss) attributable to Noncontrolling Interests) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Stockholders' Equity Note [Abstract]        
Net income (loss) $ 1.1 $ 0.8 $ 3.3 $ (7.3)
Other comprehensive income (loss):        
Foreign currency translation adjustments 0.0 (2.2) 0.4 (5.4)
Total comprehensive income (loss) $ 1.1 $ (1.4) $ 3.7 $ (12.7)