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Share Based Compensation Arrangement By Share Based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate

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Share-based Compensation Arrangement by Share-based Payment Award, Additional Holding Period

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans

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Shares of Common Stock Previously Held by Affiliate

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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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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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 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 weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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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 shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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

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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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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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Stock Transactions And Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions					12 Months Ended
	Dec. 18, 2019 USD ($)	Sep. 20, 2019 $ / shares shares	Sep. 17, 2019 shares	Sep. 16, 2019 Plans	Dec. 31, 2019 USD ($) Votes $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares) \| shares		500,000,000			500,000,000.0	100.0
Common stock, par value (in USD per share) \| $ / shares		$ 0.01			$ 0.01	$ 0.01
Preferred shares authorized (in shares) \| shares		15,000,000			15,000,000.0	0
Number of stock-based compensation plans \| Plans				0
Preferred stock, par value (in USD per share) \| $ / shares		$ 0
Common stock, shares outstanding (in shares) \| shares					158,700,000.0	100
Incremental fair value	$ 5.0
Expensed amount related to vested awards	1.0				$ 18.4	$ 13.3	$ 12.3
Dividend Yield		0.00%			0.50%	0.60%	0.70%
Estimated annual forfeiture rate					6.00%
Total unrecognized compensation cost related to RSUs/PSUs	$ 4.0
Granted (in USD per share) \| $ / shares					$ 22.34
Exercised (in USD per share) \| $ / shares						$ 48.25	$ 38.49
Aggregate intrinsic value of options exercised					$ 39.0	$ 19.0	$ 18.0
Exercise of options, cash receipts					$ 30.0	$ 14.0	$ 17.0
Grant (in USD per share) \| $ / shares					$ 24.91	$ 98.26	$ 85.22
Vested (in USD per share) \| $ / shares						65.81	55.83
Forfeited (in USD per share) \| $ / shares						$ 77.38	$ 68.04
Employee service share-based compensation, tax benefit from exercise of stock options					$ 8.0	$ 5.0	$ 8.0
Share withheld (in shares) \| shares					31,000	41,000
Payment for tax withholding					$ 4.0	$ 4.0
Common stock voting rights (in votes per share) \| Votes					1
RSUs/PSUs:
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expensed amount related to vested awards					$ 11.2	8.2	7.6
Total unrecognized compensation cost related to RSUs/PSUs					42.0
Employee service share-based compensation, tax benefit from exercise of stock options					$ 1.0	1.0	1.0
Stock options:
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					5 years
Award expiration period					10 years
Expensed amount related to vested awards					$ 7.2	5.1	4.7
Employee service share-based compensation, tax benefit from exercise of stock options					$ 5.0	$ 3.0	$ 6.0
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					3 years
Additional holding period of award					2 years
Entity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock previously held by affiliate \| shares			100
Common stock, shares outstanding (in shares) \| shares			127,900,000
IPO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock \| shares		30,800,000
The Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the Stock Plan \| shares		21,000,000