Net Loss Per Share Attributable to Common Stockholders - Computation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net loss attributable to Hippo - basic	$ (73.5)	$ (84.5)	$ (141.1)	$ (279.8)
Net loss attributable to Hippo - diluted	$ (73.5)	$ (84.5)	$ (141.1)	$ (279.8)
Weighted-average shares used in computing net loss per share attributable to Hippo - basic (in shares)	566,107,642	98,295,275	563,876,248	97,139,194
Weighted-average shares used in computing net loss per share attributable to Hippo - diluted (in shares)	566,107,642	98,295,275	563,876,248	97,139,194
Net loss per share attributable to Hippo - basic (in dollars per share)	$ (0.13)	$ (0.86)	$ (0.25)	$ (2.88)
Net loss per share attributable to Hippo - diluted (in dollars per share)	$ (0.13)	$ (0.86)	$ (0.25)	$ (2.88)