Goodwill and Other Intangible Assets - Additional information (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Indefinite-lived Intangible Assets | |||
| Goodwill recorded in acquisition | $ 120,642,000 | ||
| Impairments to definite lived intangible assets | 0 | $ 0 | $ 0 |
| Amortization expense for definite lived intangible assets | 20,900,000 | 20,300,000 | 26,300,000 |
| Impairments to indefinite lived intangible assets | 0 | $ 0 | $ 0 |
| USAA AMCO | |||
| Indefinite-lived Intangible Assets | |||
| Goodwill recorded in acquisition | 120,600,000 | ||
| Indefinite lived intangible assets | 770,100,000 | ||
| Finite lived intangible assets | $ 38,600,000 | ||