Common Stock, Vote per Share

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

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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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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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- Definition

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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- Definition

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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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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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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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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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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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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- Definition

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 (Details) $ / shares in Units, $ in Millions			12 Months Ended
	Dec. 23, 2021 USD ($) shares	Sep. 30, 2019 shares	Dec. 31, 2022 USD ($) vote $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)			500,000,000.0	500,000,000
Common stock, par value (in USD per share) \| $ / shares			$ 0.01	$ 0.01
Preferred shares authorized (in shares)			15,000,000	15,000,000
Preferred shares outstanding (in shares)			0	0
Preferred shares issued (in shares)			0	0
Common stock voting rights (in votes per share) \| vote			1
Total unrecognized compensation cost related to RSUs/PSUs \| $			$ 43.6
Granted (in shares)			600,000	500,000	700,000
Unvested (in shares)			1,500,000	1,700,000	1,900,000	2,100,000
Expected forfeiture rate			6.00%	6.00%	6.00%
Period of recognition			2 years
Aggregate intrinsic value of options exercised \| $			$ 31.0	$ 33.0	$ 12.0
Employee service share-based compensation, tax benefit from exercise of stock options \| $			$ 7.2	$ 6.7	4.2
Share withheld (in shares)			192,400	181,700
Tax withholding payment related to net settlement of equity awards \| $			$ 9.1	$ 7.2	5.0
RSUs / PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, tax benefit from exercise of stock options \| $			$ 1.0	$ 1.0	$ 1.0
RSUs / PSUs \| Pacific Dental Services
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Total unrecognized compensation cost related to RSUs/PSUs \| $	$ 12.5
Granted (in shares)	273,522
Unvested (in shares)			273,522
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield			0.00%	0.00%	0.00%
Employee service share-based compensation, tax benefit from exercise of stock options \| $			$ 4.0	$ 4.0	$ 1.0
2019 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the Stock Plan (in shares)		21,000,000
Award expiration period		10 years
2019 Omnibus Incentive Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
2019 Omnibus Incentive Plan \| Minimum \| RSUs / PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
2019 Omnibus Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		5 years
2019 Omnibus Incentive Plan \| Maximum \| RSUs / PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		5 years