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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) d $ / shares shares	Mar. 31, 2023 $ / shares shares	Dec. 31, 2023 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding (in shares)	435,135
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units outstanding (in shares)	726,367		506,425
Granted (in shares)	347,275
Weighted-average period to recognize compensation cost (in years)	2 years 7 months 6 days
Restricted Stock And Restricted Stock Unit (RSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	347,275	271,614
Restricted Stock And Restricted Stock Unit (RSU) \| Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting periods	1 year
Market-based Restricted Stock Awards (PSAs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		167,606
Trading days \| d	20
Trading days, lookback \| d	30
Weighted-average period to recognize compensation cost (in years)	1 year 9 months 18 days
Restricted Stock, Restricted Stock Unit (RSU), Market-based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to non-vested awards granted \| $	$ 84.1
Restricted Stock Awards (RSAs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average period to recognize compensation cost (in years)	1 year 9 months 18 days
Market-based Restricted Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units outstanding (in shares)	573,727		270,772
Granted (in shares)	308,970
Weighted-average grant-date fair values of restricted stock awards granted (in dollars per share) \| $ / shares	$ 87.17	$ 70.07
Weighted-average period to recognize compensation cost (in years)	2 years 7 months 6 days
Minimum \| Restricted Stock And Restricted Stock Unit (RSU) \| Senior Staff
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting periods	3 years
Minimum \| Restricted Stock And Restricted Stock Unit (RSU) \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting periods	3 years
Minimum \| Market-based Restricted Stock Awards (PSAs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair values of restricted stock awards granted (in dollars per share) \| $ / shares	$ 83.61
Minimum \| Market-based Restricted Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	0.00%
Maximum \| Restricted Stock And Restricted Stock Unit (RSU) \| Senior Staff
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting periods	4 years
Maximum \| Restricted Stock And Restricted Stock Unit (RSU) \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting periods	8 years
Maximum \| Market-based Restricted Stock Awards (PSAs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair values of restricted stock awards granted (in dollars per share) \| $ / shares	$ 103.76
Maximum \| Market-based Restricted Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	200.00%
2015 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum issuance of common stock (in shares)	4,200,000
Number of shares available for issuance (in shares)	126,565
2015 Stock Option Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units outstanding (in shares)	726,367
2015 Stock Option Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market value of common stock (as a percent)	100.00%