Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance under the 2016 Plan (in shares)	1,438,454		1,438,454
Stock options, granted (in shares)			105,640
Stock options, weighted average exercise price (in dollars per share)			$ 306.92
Stock options, weighted average grant date fair value (in dollars per share)			$ 108.88
Risk-free interest rate (in hundredths)			4.10%
Expected life (in years)			5 years 8 months 12 days
Stock volatility (in hundredths)			29.80%
Dividend yield (in hundredths)			0.30%
Stock-based compensation expense	$ 5.9	$ 6.0	$ 21.9	$ 17.0
Performance Share Unit (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			37,536
Grant date fair value (in dollars per share)			$ 306.91
Performance Share Unit (PSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target award percentage			0.00%
Performance Share Unit (PSUs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target award percentage			200.00%
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			4,563
Grant date fair value (in dollars per share)			$ 310.56