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Changes in Stockholders' Equity (Schedule of Comprehensive Income for Noncontrolling Interest) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract]        
Net income (loss) $ 1.6 $ (9.7) $ 2.2 $ (8.1)
Other comprehensive income (loss):        
Foreign currency translation adjustments 0.8 2.5 0.4 (3.2)
Total comprehensive income (loss) $ 2.4 $ (7.2) $ 2.6 $ (11.3)