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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based compensation plans
Shares authorized for future grant		2,182,604
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	75,275
Granted (in shares)		0
Exercised (in shares)		(6,000)	(20,000)	(48,275)
Expired or forfeited (in shares)				(1,000)
Outstanding at the end of the year (in shares)		0	6,000	26,000
Weighted Average Exercise Price
Outstanding at the beginning of the year, Weighted Average Exercise Price (in dollars per share)		$ 44.99	$ 41.76	$ 52.30
Exercised, Weighted Average Exercise Price (in dollars per share)		$ 44.99	40.80	57.91
Expired or forfeited, Weighted Average Exercise Price (in dollars per share)				55.73
Outstanding at the end of the year, Weighted Average Exercise Price (in dollars per share)			$ 44.99	$ 41.76
Additional share-based compensation disclosures
Proceed from option exercises		$ 0.3	$ 0.8	$ 2.8
Total intrinsic value of all options exercised		0.4	1.0	1.6
Tax benefit realized from option and RSU exercises		$ 6.1	$ 5.5	$ 4.9

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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 extension of term of the plan.

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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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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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