Stock-Based Compensation - Schedule of Restricted Stock Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 9.6	$ 8.9	$ 7.5
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vested, number of shares	(22,684)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Ending Balance	$ 3,073.8	1,986.6	1,959.8	$ 2,013.9
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, restricted stock award	458,176			(27,247)
Stock compensation expense	$ 9.6	$ 8.9	7.5
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock, beginning of year, number of shares	521,012
Granted, number of shares	458,176
Vested, number of shares	(131,199)
Forfeited, number of shares	(106,891)
Restricted stock, end of year, number of shares	741,098	521,012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Restricted stock, beginning of year, weighted-average measurement date fair value (in dollars per share)	$ 39.73
Granted, weighted average grant date fair value (in dollars per share)		$ 38.67
Vested, weighted average grant date fair value (in dollars per share)		39.92
Forfeited, weighted average grant date fair value (in dollars per share)		38.61
Restricted stock, end of year, weighted-average measurement date fair value (in dollars per share)	$ 38.94	$ 39.73
Tax benefits from stock-based compensation	$ (0.3)	$ (0.3)	(0.1)
Unrecognized compensation cost related to nonvested restricted stock awards	$ 15.8
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 2 months 26 days
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 9.6	8.9	7.5
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Ending Balance	$ 2,478.2	$ 945.0	$ 941.1	$ 1,049.3
Upon Achievement of Defined Total Return to Shareholder Goals | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, restricted stock award	131,791
Upon One-Third Annual Anniversary | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, restricted stock award	182,996
Upon Achievement of Performance Goals | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, restricted stock award	263,582
Upon Achievement of Defined Return on Equity Performance Goals | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, restricted stock award	131,791
One Year from Grant Date | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, restricted stock award	38,845
Time-restricted shares | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, restricted stock award	221,841