Stock-Based Compensation - Restricted Stock Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Stock-based compensation expense	$ 28.3	$ 24.6	$ 23.1
Stock-based compensation expense for retirement savings plan contributions	4.6	4.4	4.0
Associated current and future income tax benefit recognized	7.8	$ 6.4	$ 3.8
Unrecognized compensation cost related to non-vested share-based awards	$ 36.7
Unrecognized compensation cost, weighted-average period for recognition	2 years
Requisite service period	3 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Awards granted (in dollars per share)		$ 75.76	$ 76.48
Awards granted (in dollars per share)		$ 75.76	$ 76.48
Fair value of shares vested	$ 19.7	$ 32.0	$ 44.1
Requisite service period	3 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Awards granted (in shares)	10,842
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Awards granted (in dollars per share)	$ 80.90
Awards granted (in dollars per share)	$ 80.90
Stock-based compensation expense	$ 0.1
Unrecognized compensation cost related to non-vested share-based awards	$ 0.7
Unrecognized compensation cost, weighted-average period for recognition	3 years
Long Term Incentive Plan 2012 | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock awards outstanding at beginning of period (in shares)	616,000
Awards granted (in shares)	449,000
Awards vested (in shares)	(307,000)
Awards forfeited (in shares)	(44,000)
Restricted stock awards outstanding at end of period (in shares)	714,000	616,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Awards outstanding at beginning of period (in dollars per share)	$ 72.02
Awards granted (in dollars per share)	64.74
Awards vested (in dollars per share)	64.29
Awards forfeited (in dollars per share)	71.43
Awards outstanding at end of period (in dollars per share)	70.80	$ 72.02
Awards granted (in dollars per share)	$ 64.74