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Stock-Based Compensation Plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	May 20, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based compensation plans
Shares authorized for future grant		1,958,281
Directors Equity Plan
Additional share-based compensation disclosures
Extension period of plan	10 years
Unvested RSUs
Additional share-based compensation disclosures
Increase in number of shares available for issuance under the plan (in shares)	1,500,000
Stock options
Option Shares
Outstanding at the beginning of the year (in shares)			6,000	26,000
Granted (in shares)		0
Exercised (in shares)		0	(6,000)	(20,000)
Outstanding at the end of the year (in shares)				6,000
Weighted Average Exercise Price
Outstanding at the beginning of the year, Weighted Average Exercise Price (in dollars per share)			$ 44.99	$ 41.76
Exercised, Weighted Average Exercise Price (in dollars per share)			$ 44.99	40.80
Outstanding at the end of the year, Weighted Average Exercise Price (in dollars per share)				$ 44.99
Additional share-based compensation disclosures
Proceed from option exercises			$ 0.3	$ 0.8
Total intrinsic value of all options exercised			0.4	1.0
Tax benefit realized from option and RSU exercises		$ 6.8	$ 6.1	$ 5.5

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Amount of tax benefit from exercise of stock options and RSU granted under share-based compensation arrangement.

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The increase in number of shares (or other type of equity) authorized for issuance under the plan.

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