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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract]        
Net (loss) income $ (1.0) $ 0.1 $ (0.3) $ 2.0
Other comprehensive (loss) income:        
Foreign currency translation adjustments (2.2) (1.0) (2.1) 0.6
Total comprehensive (loss) income $ (3.2) $ (0.9) $ (2.4) $ 2.6