Stock Based Compensation - Stock Options, Restricted Stock and Restricted Stock Units Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock options
Number of options
Balance at beginning of period (shares)	11,094,868
Granted (in shares)	0	4,914,868
Forfeited (shares)	(229,000)
Exercised (shares)	0	0	0
Balance at end of period (shares)	10,865,868	11,094,868
Weighted-average exercise price
Balance at beginning of period (USD per share)	$ 19.29
Granted (USD per share)	0
Forfeited (USD per share)	18.56
Exercised (USD per share)	0
Balance at end of period (USD per share)	$ 19.31	$ 19.29
Expected to vest at end of period (shares)	4,785,868
Exercisable at end of period (shares)	6,080,000
Expected to vest at end of period (USD per share)	$ 15.89
Exercisable at end of period (USD per share)	$ 22.00
Weighted-average remaining contractual term (in years)	5 years 8 months 12 days	6 years 9 months 18 days
Weighted average remaining contractual term (in years) of options expected to vest	8 years 6 months
Weighted average remaining contractual term (in years) of options exercisable	3 years 6 months
Aggregate intrinsic value	$ 0.0	$ 0.0
Aggregate intrinsic value of options expected to vest	0.0
Aggregate intrinsic value of options exercisable	$ 0.0
Restricted stock and restricted stock units
Number of shares
Balance at beginning of period (shares)	7,007,683
Granted (shares)	5,000,399
Forfeited (shares)	(603,594)
Vested (shares)	(2,721,965)
Balance at end of period (shares)	8,682,523	7,007,683
Weighted-average grant date fair value
Balance at beginning of period (USD per share)	$ 17.28
Granted (USD per share)	11.27
Forfeited (USD per share)	15.37
Vested (USD per share)	17.59
Balance at end of period (USD per share)	$ 13.78	$ 17.28
Weighted-average remaining contractual term (in years)	1 year	1 year 2 months 12 days
Aggregate intrinsic value	$ 101.6	$ 85.9

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of share options (or share units) exercised during the current period.

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