Equity-Based Compensation (Narrative) (Details) shares in Millions	6 Months Ended
Jun. 30, 2021 $ / shares shares
PSA and RSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for stock compensation (shares) \| shares	0.1
Performance stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares granted \| $ / shares	$ 69.72
Performance share award granted under stock incentive plan, performance period	3 years
Performance stock awards [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Actually Issued, as a Percent of the Amount Subject to the Performance Share Award	0.00%
Performance stock awards [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Actually Issued, as a Percent of the Amount Subject to the Performance Share Award	200.00%
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares granted \| $ / shares	$ 55.67
Restricted stock units [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Restricted stock units [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Long-Term Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future use \| shares	1.0

Number of Shares Actually Issued, as a Percent of the Amount Subject to the Performance Share Award

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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.

+ References

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The weighted average fair value at grant date for nonvested equity-based awards issued 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 difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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