Share-Based Compensation/Equity Awards and Purchase Plans (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Treasury Class-A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 44.7	$ 54.5	$ 104.4
Total unrecognized compensation cost from restricted stock	$ 138.1
Nonvested shares - Weighted Average Grant Date Fair Value	$ 460.22	$ 516.85
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Restricted Stock Units Granted	193,937
Restricted Stock Units - Vested	(113,419)
Restricted Stock Units - Forfeited	(50,167)
Weighted Average Grant Date Fair Value - Granted	$ 393.16
Restricted Stock Units Vested - Weighted-Average Grant-Date Fair Value	485.12
Resticted Stock Units Cancelled/forfeited - Weighted-Average Grant-Date Fair Value	$ 499.45
Weighted Average Remaining Contractual Term (in years)	1 year 9 months 10 days
Resticted Stock Units Outstanding Aggregate Intrinsic Value (in millions)	$ 111.3
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	344,593	314,242
Performance-based Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares - Weighted Average Grant Date Fair Value	$ 413.39	$ 486.25
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Restricted Stock Units Granted	16,296
Restricted Stock Units - Vested	0
Restricted Stock Units - Forfeited	(4,520)
Weighted Average Grant Date Fair Value - Granted	$ 366.47
Restricted Stock Units Vested - Weighted-Average Grant-Date Fair Value	0
Resticted Stock Units Cancelled/forfeited - Weighted-Average Grant-Date Fair Value	$ 427.84
Weighted Average Remaining Contractual Term (in years)	1 year 6 months 14 days
Resticted Stock Units Outstanding Aggregate Intrinsic Value (in millions)	$ 7.5
Options Vesting Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	23,167	11,391

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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