Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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Number of shares authorized for issuance under share-based payment arrangement.

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

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Period from grant date that an equity-based award expires, 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 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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Share-Based Incentive Plan (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
	Nov. 16, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares exercised				27,615
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		4,449,642	5,576,490	6,711,731	6,347,709
Restricted stock \| Vest ratably in five years or less [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award vesting period, in years		3 years
Number of restricted stock awards, granted		11,471,308
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards, granted		16,880,145
Long Term Incentive Plan 2003
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares exercised	6,757,640
Common stock shares reserved for issuance to employees	13,535,627
Total unrecognized compensation expense, net of estimated forfeitures		$ 171.2
Weighted-average period over which total unrecognized compensation expense expected to be recognized (years)		1 year 6 months
Intrinsic value of stock-based awards exercised and restricted stock units converted		$ 51.8	$ 78.1
Long Term Incentive Plan 2003 \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award expiration period, in years		10 years
Average remaining contractual term for options outstanding, in years		4 years 1 month 6 days
Average remaining contractual term for options vested and expected to vest, in years		4 years 1 month 6 days
Average remaining contractual term for options exercisable, in years		3 years 10 months 24 days
Long Term Incentive Plan 2003 \| Minimum \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award vesting period, in years		3 years
Long Term Incentive Plan 2003 \| Maximum \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award vesting period, in years		4 years
2020 Stock Incentive Plan and 2003 Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of common stock shares authorized	72,500,000
Not subject to market conditions \| Performance Shares \| Vest after three years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards, granted		290,173
Subject to Market Conditions \| Performance Shares \| Vest after three years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award vesting period, in years		3 years
Number of restricted stock awards, granted		5,118,664