Changes in Stockholders' Equity (Schedule of Comprehensive Income for Noncontrolling Interest) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract]
Net income	$ 1.6	$ 0.6
Other comprehensive (loss) income:
Foreign currency translation adjustments	(5.7)	1.5
Total comprehensive (loss) income	$ (4.1)	$ 2.1

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

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