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Stock-Based Compensation Plans - RSUs (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Additional share-based compensation disclosures
Total unrecognized compensation cost			$ 48.3
Weighted average recognition period for unrecognized compensation cost (in years)			1 year 1 month 6 days
RSUs, 2020 grant
Shares
The number of grants made during the period on the basis of service and 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
Share of common stock			1
Changes
Granted (in shares)			540,547
Weighted Average Grant Date Fair Value
Granted (in dollars per share)			$ 82.81
RSUs, 2019 grant
Shares
The number of grants made during the period on the basis of service and 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
Share of common stock				1
Changes
Granted (in shares)				488,345
Weighted Average Grant Date Fair Value
Granted (in dollars per share)				$ 88.05
RSUs, 2018 grant
Shares
The number of grants made during the period on the basis of service and 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).					178,970
Share of common stock					1
Changes
Granted (in shares)					474,715
Weighted Average Grant Date Fair Value
Granted (in dollars per share)					$ 84.26
Unvested RSUs
Changes
Unvested at the beginning of the year (in shares)		995,720	859,005
Granted (in shares)			540,547
Vested (in shares)			(369,990)
Cancelled or forfeited (in shares)			(33,842)
Unvested at the end of the period (in shares)			995,720	859,005
Weighted Average Grant Date Fair Value
Unvested at the beginning of the year (in dollars per share)		$ 85.27	$ 86.40
Granted (in dollars per share)			82.81
Vested (in dollars per share)			84.31
Cancelled or forfeited (in dollars per share)			85.21
Unvested at the end of the period (in dollars per share)			$ 85.27	$ 86.40
Aggregate Fair Value
Unvested at the end of the period			$ 119.2
Additional share-based compensation disclosures
Fair value of vested units			54.0	$ 56.5	$ 34.6
All stock-based compensation plans
Shares
Payments to tax authorities on employees' behalf for shares withheld related to share settlements			$ 23.1	$ 16.2	$ 12.3
Performance-based | RSU's
Shares
Performance target period (in years)	3 years	3 years	3 years
Directors Equity Plan | Stock Awards
Changes
Granted (in shares)			12,807	11,640	13,880
Weighted Average Grant Date Fair Value
Granted (in dollars per share)			$ 91.30	$ 89.34	$ 93.65

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