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Stock Transactions And Stock-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 23, 2021
USD ($)
shares
Dec. 18, 2019
USD ($)
Sep. 20, 2019
$ / shares
shares
Sep. 17, 2019
shares
Sep. 16, 2019
plan
Dec. 31, 2021
USD ($)
vote
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock, shares authorized (in shares)     500,000,000.0     500,000,000 500,000,000    
Common stock, par value (in USD per share) | $ / shares     $ 0.01     $ 0.01 $ 0.01    
Preferred shares authorized (in shares)     15,000,000.0     15,000,000 15,000,000    
Common stock, shares outstanding (in shares)           161,600,000 160,000,000    
Preferred shares issued (in shares)           0 0    
Preferred shares outstanding (in shares)           0 0    
Common stock voting rights (in votes per share) | vote           1      
Number of stock-based compensation plans (in plans) | plan         0        
Incremental fair value | $   $ 5.0              
Expensed amount related to vested awards | $   1.0       $ 27.7 $ 22.2 $ 18.1  
Total unrecognized compensation cost related to RSUs/PSUs | $   $ 4.0       $ 41.4      
Granted (in shares)           500,000 700,000 400,000  
Unvested (in shares)           1,700,000 1,900,000 2,100,000 400,000
Dividend yield     0.00%     0.00% 0.00% 0.50%  
Expected forfeiture rate           6.00% 6.00% 6.00%  
Period of recognition           2 years      
Aggregate intrinsic value of options exercised | $           $ 33.0 $ 12.0 $ 39.0  
Proceeds from stock option exercises | $           $ 19.5 $ 13.8 0.0  
Grant (in USD per share) | $ / shares           $ 38.76 $ 25.76    
Employee service share-based compensation, tax benefit from exercise of stock options | $           $ 6.7 $ 4.2 8.4  
Share withheld (in shares)           181,700 171,600    
Payment for tax withholding | $           $ 7.0 $ 5.0    
Danaher                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Proceeds from stock option exercises | $             14.0 30.0  
Stock options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Expensed amount related to vested awards | $           12.2 8.9 7.1  
Employee service share-based compensation, tax benefit from exercise of stock options | $           4.0 1.0 5.0  
Restricted stock units (RSUs)                  
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  
Restricted stock units (RSUs) | Pacific Dental Services                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Total unrecognized compensation cost related to RSUs/PSUs | $ $ 12.5                
Award vesting period 3 years                
Granted (in shares) 273,522                
Unvested (in shares)           273,522      
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 | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period     5 years            
2019 Omnibus Incentive Plan | Restricted stock units (RSUs) | Minimum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period     3 years            
2019 Omnibus Incentive Plan | Restricted stock units (RSUs) | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period     5 years            
Affiliated entity                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares of common stock previously held by affiliate (in shares)       100          
Common stock, shares outstanding (in shares)       127,900,000          
IPO                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Issuance of common stock (in shares)     30,800,000            
Granted (in USD per share) | $ / shares               $ 22.34  
Grant (in USD per share) | $ / shares               $ 24.91