Revenue - Contract Balances (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 322.5	$ 319.3
Short-term contract assets	2.0	0.7
Long-term contract assets	5.8	3.8
Short-term deferred revenue	592.3	477.2	[1]
Long-term deferred revenue	$ 13.8	$ 14.6

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