Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 23.9	$ 33.2
Other comprehensive income (loss):
Foreign currency translation adjustment	(40.4)	3.4
Unrealized gains (losses) on securities, net of tax:
Unrealized holding gains (losses) arising during period	(4.1)	1.9
Reclassification losses (gains) included in net income	0.3	(0.5)
Other comprehensive income (loss)	(44.2)	4.8
Comprehensive income	$ (20.3)	$ 38.0