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Changes in Stockholders' Equity (Schedule of Comprehensive Income for Noncontrolling Interest) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract]    
Net income $ 0.6 $ 0.7
Other comprehensive income:    
Foreign currency translation adjustments 1.5 0.1
Total comprehensive income $ 2.1 $ 0.8