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Changes in Stockholders' Equity (Schedule of Comprehensive Income for Noncontrolling Interest) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract]    
Net income $ 0.6 $ 1.6
Other comprehensive loss:    
Foreign currency translation adjustments (0.4) (5.7)
Total comprehensive income (loss) $ 0.2 $ (4.1)