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Share-based Compensation and Other Employment Benefit Plans - Narrative (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2019 shares | Dec. 31, 2021 USD ($) simulation shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Award requisite service period |  | 3 years |  |
Tax benefit recognized from compensation expense |  | $ 7.0 | $ 4.8 | $ 6.3
Unrecognized compensation cost |  | $ 30.3 |  |
Unrecognized compensation cost, period of recognition (years) |  | 1 year 10 months 13 days |  |
Stock option grants (in shares) | shares |  | 0 | 0 | 0
Assumed in acquisition (in shares) | shares |  | 0 | 0 | 3,230,000
Options outstanding, intrinsic value |  | $ 37.2 |  |
Options outstanding, weighted average remaining contractual term (years) |  | 2 years 6 months 3 days |  |
Options exercised, intrinsic value |  | $ 21.3 | $ 5.3 | $ 13.6
Performance period |  | 3 years |  |
FCB Financial Holdings, Inc. |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Assumed in acquisition (in shares) | shares | 3,200,000 |  |  |
Market/Performance Share Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of simulations | simulation |  | 100,000 |  |
Non-option awards vested, total fair value |  | $ 2.4 | 7.9 | 5.7
Performance Share Units (PSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Percentage of awards subject to market condition |  | 50.00% |  |
Percentage of awards subject to ROATCE |  | 50.00% |  |
vesting |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
performance period |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
ROAA and ROATCE |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Restricted Share Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Non-option awards vested, total fair value |  | $ 19.8 | $ 13.4 | $ 11.2
Minimum | Market/Performance Share Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting range based on return on average assets (ROAA) |  | 75.00% |  |
Minimum | Performance Share Units (PSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options, vested and expected to vest, range based on return on average assets |  | 0.00% |  |
Maximum | Market/Performance Share Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting range based on return on average assets (ROAA) |  | 125.00% |  |
Maximum | Performance Share Units (PSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options, vested and expected to vest, range based on return on average assets |  | 150.00% |  |
2021 Omnibus Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares of authorized but unissued common stock reserved for future grants (in shares) | shares |  | 5,800,000 |  |

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