Stock Transactions And Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Jan. 21, 2022 USD ($) shares	Dec. 31, 2024 USD ($) vote $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)		500,000,000.0	500,000,000.0
Common stock, par value (in USD per share) | $ / shares		$ 0.01	$ 0.01
Preferred shares authorized (in shares)		15,000,000.0	15,000,000.0
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 | $		$ 43.3
Granted (in shares)		2,200,000	1,000,000.0	600,000
Vested (in period)		700,000	600,000	500,000
Unvested (in shares)		2,900,000	1,700,000	1,500,000	1,700,000
Expected forfeiture rate		12.00%	12.00%	6.00%
Period of recognition		2 years
Aggregate intrinsic value of options exercised | $		$ 0.8	$ 9.0	$ 31.0
Employee service share-based compensation, tax benefit from exercise of stock options | $		$ 1.6	$ 3.6	7.2
Share withheld (in shares)		242,000.0	214,800
Tax withholding payment related to net settlement of equity awards | $		$ 5.3	$ 7.9	$ 9.1
RSUs | Pacific Dental Services
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
Total unrecognized compensation cost related to RSUs/PSUs | $	$ 12.5
Granted (in shares)	273,522
Vested (in period)		91,174
Unvested (in shares)		182,348
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 | $		$ 0.1	$ 1.3	$ 3.5
Restricted Stock Units And Performance-Based Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, tax benefit from exercise of stock options | $		$ 0.0	$ 0.2	$ 1.1
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
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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		5 years