Revenue - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Increase (decrease) in deferred revenue during period	$ 91.3	$ 12.6
Revenues recognized that were included in deferred revenue		428.9		$ 477.1
Increase (decrease) in contract asset	8.0	1.0
Contract assets reclassified to receivables		2.1		$ 3.0
Commission assets, net of accumulated amortization	$ 116.1	$ 83.8	[1]

[1] See discussion in Note 1 - Basis of Presentation and Description of Business for further detail regarding the elimination of the International lag reporting.