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Stock-Based Compensation Plans - RSUs and PSUs (Details) - USD ($) $ / shares in Units, $ in Millions	2 Months Ended	12 Months Ended
	Feb. 28, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Additional share-based compensation disclosures
Total unrecognized compensation cost				$ 65.9
Weighted average recognition period for unrecognized compensation cost (in years)				1 year 7 months 6 days
RSUs, 2021 grant
Units
The number of grants made during the period on the basis of service and/or performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).				191,139
Share of common stock				1
Changes
Granted (in units)				318,495
Weighted Average Grant Date Fair Value
Granted (in dollars per unit)				$ 141.41
RSUs, 2020 grant
Units
The number of grants made during the period on the basis of service and/or performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).					330,144
Share of common stock					1
Changes
Granted (in units)					540,547
Weighted Average Grant Date Fair Value
Granted (in dollars per unit)					$ 82.81
RSUs, 2019 grant
Units
The number of grants made during the period on the basis of service and/or performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).						294,190
Share of common stock						1
Changes
Granted (in units)						488,345
Weighted Average Grant Date Fair Value
Granted (in dollars per unit)						$ 88.05
PSUs, 2021 grant
Units
The number of grants made during the period on the basis of service and/or performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).				127,356
PSUs, 2020 grant
Units
The number of grants made during the period on the basis of service and/or performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).					210,403
PSUs, 2019 grant
Units
The number of grants made during the period on the basis of service and/or performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).						194,155
Changes
Vested (in shares)	376,090
Additional share-based compensation disclosures
Fair value of vested units	$ 61.0
Restricted stock units (RSUs) and performance stock units (PSUs)
Changes
Unvested at the beginning of the year (in units)	831,597		831,597	995,720
Granted (in units)				318,495
Vested (in units)				(462,642)
Cancelled or forfeited (in units)				(19,976)
Unvested at the end of the period (in units)				831,597	995,720
Weighted Average Grant Date Fair Value
Unvested at the beginning of the year (in dollars per unit)	$ 105.12		$ 105.12	$ 85.27
Granted (in dollars per unit)				141.41
Vested (in dollars per unit)				88.02
Cancelled or forfeited (in dollars per unit)				90.26
Unvested at the end of the period (in dollars per unit)				$ 105.12	$ 85.27
Aggregate Fair Value
Unvested at the end of the period				$ 188.8
Additional share-based compensation disclosures
Fair value of vested units				126.0	$ 54.0	$ 56.5
All stock-based compensation plans
Units
Payments to tax authorities on employees' behalf for shares withheld related to share settlements				$ 21.2	$ 23.1	$ 16.2
Performance stock units (PSUs)
Units
Performance target period (in years)		3 years	3 years	3 years
Maximum | PSUs, 2021 grant
Units
Share of common stock				2
Maximum | PSUs, 2020 grant
Units
Share of common stock					2
Maximum | PSUs, 2019 grant
Units
Share of common stock						2
Directors Equity Plan | Stock Awards
Changes
Granted (in units)				6,248	12,807	11,640
Weighted Average Grant Date Fair Value
Granted (in dollars per unit)				$ 166.39	$ 91.30	$ 89.34

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