Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (401.8)	$ (659.2)
Net Carrying Amount	480.5
Gross  Carrying Amount	1,644.2	1,914.3
Net Carrying Amount	1,242.4	1,255.1
Trade names and branding
Indefinite-lived Intangible Assets [Line Items]
Carrying Amount	445.0	445.0
Domain portfolio
Indefinite-lived Intangible Assets [Line Items]
Carrying Amount	248.6	250.3
Contractual-based assets and other
Indefinite-lived Intangible Assets [Line Items]
Carrying Amount	68.3	67.0
Customer-related
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	536.9	857.0
Accumulated Amortization	(251.1)	(534.7)
Net Carrying Amount	285.8	322.3
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	238.9	188.1
Accumulated Amortization	(111.4)	(90.7)
Net Carrying Amount	127.5	97.4
Trade names and other
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	106.5	106.9
Accumulated Amortization	(39.3)	(33.8)
Net Carrying Amount	$ 67.2	$ 73.1