Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income		$ (19.2)	$ 8.6
Items of other comprehensive loss before income taxes:
Change in foreign currency translation adjustment		11.0	(49.1)
Change in unrealized (loss) gain from invested customer funds		(16.7)	23.4
Change in pension liability adjustment	[1]	3.8	3.3
Other comprehensive loss before income taxes		(1.9)	(22.4)
Income tax (benefit) expense, net		(3.4)	6.8
Other comprehensive income (loss) after income taxes		1.5	(29.2)
Comprehensive loss		$ (17.7)	$ (20.6)

[1] The amount of the pension liability adjustment recognized in the condensed consolidated statements of operations within other expense, net was $3.8 million and $3.2 million during the three months ended March 31, 2021, and 2020, respectively.