Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 8.6	$ 11.2
Items of other comprehensive income (loss) before income taxes:
Change in foreign currency translation adjustment		(49.1)	12.3
Change in unrealized gain from invested customer trust funds		23.4	21.9
Change in pension liability adjustment	[1]	3.3	2.5
Other comprehensive (loss) income before income taxes		(22.4)	36.7
Income tax expense, net		6.8	2.7
Other comprehensive (loss) income after income taxes		(29.2)	34.0
Comprehensive (loss) income		$ (20.6)	$ 45.2

[1] The amount of the pension liability adjustment recognized in the condensed consolidated statements of operations within other expense, net was $3.2 million and $2.6 million during the three months ended March 31, 2020, and 2019, respectively.