Changes in Stockholders' Equity (Schedule of Comprehensive Income for Noncontrolling Interest) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract]
Net (loss) income	$ (0.4)	$ 0.1	$ (0.7)	$ 2.1
Other comprehensive (loss) income:
Foreign currency translation adjustments	(0.9)	0.5	(3.0)	1.1
Total comprehensive (loss) income	$ (1.3)	$ 0.6	$ (3.7)	$ 3.2