Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	[1]
Revenue from Contract with Customer [Abstract]
Increase in deferred revenue during period	$ 155.0
Revenues recognized that were included in deferred revenue	219.4
Increase in contract asset	1.9
Contract assets reclassified to receivables	1.8
Commission assets, net of accumulated amortization	$ 87.2	$ 83.8

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