Fair Value Measurements - Valuation techniques and significant unobservable inputs (Details)	Dec. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Level 3 | Fair value measurements, nonrecurring | Goodwill and Intangible Assets | Terminal Growth Rate
Changes in fair value of the recurring Level 3 fair value measurement
Asset, measurement input	0.03	0.01
Level 3 | Fair value measurements, nonrecurring | Goodwill and Intangible Assets | Discounted cash flow
Changes in fair value of the recurring Level 3 fair value measurement
Asset, measurement input	0.113	0.091
Consolidated VIEs
Changes in fair value of the recurring Level 3 fair value measurement
Investment securities	$ 250,900,000		$ 214,600,000