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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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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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Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period, Total Intrinsic Value And Equity Instruments Other Than Options, Vested In Period, Intrinsic Value

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No definition available.

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Share-Based Incentive Plan (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	5,905,480		6,711,731
Long-Term Incentive Plan 2003
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense, net of estimated forfeitures	$ 232.6
Weighted-average period over which total unrecognized compensation expense expected to be recognized, in years	2 years 1 month 6 days
Intrinsic value of stock-based awards exercised and restricted stock units converted	$ 30.8	$ 19.0
Long-Term Incentive Plan 2003 \| Stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average remaining contractual term for stock awards outstanding, in years	5 years 3 months 18 days
Average remaining contractual term for stock awards vested and expected to vest, in years	5 years 3 months 18 days
Average remaining contractual term for stock awards exercisable, in years	4 years 10 months 24 days
Long-Term Incentive Plan 2003 \| Stock awards \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award vesting period, in years	3 years