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Aggregate dividends paid during the period for each share of common stock outstanding.

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

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares that have been repurchased and retired during the period.

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SHAREHOLDERS' EQUITY - NARRATIVE (Details) $ / shares in Units, $ in Millions	4 Months Ended			8 Months Ended			12 Months Ended				60 Months Ended	72 Months Ended
	Apr. 30, 2022 $ / shares	Apr. 30, 2021 $ / shares	Apr. 30, 2020 $ / shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2018 shares	Dec. 31, 2014	Dec. 31, 2020 USD ($) shares	Jan. 30, 2009 right
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock purchased and retired (in shares) \| shares							7,600,000	16,600,000	14,500,000
Repurchased and retired during period, value							$ 180.0	$ 402.4	$ 263.0
Stock repurchase program, remaining repurchase authorized amount				$ 186.9			186.9
Dividends, common stock, cash				$ 65.0	$ 66.1	$ 67.4	$ 65.0	$ 66.1	$ 67.4			$ 67.4
Dividends (in USD per share) \| $ / shares	$ 0.13	$ 0.12	$ 0.11	$ 0.14	$ 0.13	$ 0.12	$ 0.55	$ 0.51	$ 0.47
Available for future grant (in shares) \| shares				5,600,000	7,800,000	8,800,000	5,600,000	7,800,000	8,800,000			8,800,000
Options granted (in shares) \| shares							0	0	0
Proceeds from stock options exercised							$ 10.4	$ 18.4	$ 16.5
Number of rights for each share \| right													1
Number of shares purchased by each right \| shares				0.001			0.001
Price of junior preferred stock (per 1/1000 of a share) (in USD per share) \| $ / shares				$ 95.00			$ 95.00
Junior preferred stock right becomes exercisable when a person or group becomes owner of stated percentage (more than)							4.99%
Series E Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Series E junior participating preferred stock par value (in USD per share) \| $ / shares				$ 0.01			$ 0.01
Five Year Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares) \| shares										1,600,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period							10 years
Allocated share-based compensation expense							$ 0.9	1.6	2.6
Allocated share-based compensation expense, net of tax							$ 0.7	$ 1.3	$ 2.1
Effect of compensation expense related to stock options on basic and diluted earnings per share (in USD per share) \| $ / shares							$ 0.01	$ 0.01	$ 0.01
Unrecognized compensation expense				$ 0.3			$ 0.3
Weighted average recognition period							4 months 24 days
Employee Stock Option \| Years 2010 through 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period											7 years
Vesting period											3 years
Employee Stock Option \| Years 2015 through 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period												10 years
Vesting period												3 years
Employee Stock Option \| Year 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period										10 years
Vesting period										5 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							3 years
Allocated share-based compensation expense							$ 9.9	$ 9.0	$ 8.7
Unrecognized compensation expense				9.8	$ 8.7		$ 9.8	$ 8.7
Weighted average recognition period							1 year 10 months 24 days
Granted (in shares) \| shares							509,000
Granted (in USD per share) \| $ / shares							$ 23.59	$ 23.53	$ 18.28
Grant date fair value of performance shares awarded				12.0	10.5	$ 9.5	$ 12.0	$ 10.5	$ 9.5			$ 9.5
Fair value of vested shares							$ 8.3	$ 8.4	$ 6.8
Restricted Stock \| Directors, Officers, and Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) \| shares							500,000	400,000	500,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense							$ 13.8	$ 14.6	$ 12.5
Granted (in shares) \| shares							400,000	400,000	500,000
Grant date fair value of performance shares awarded				$ 10.5	$ 9.9		$ 10.5	$ 9.9
Performance unit payout							200.00%	200.00%	200.00%
Performance Shares \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period							1 year
Performance Shares \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period							3 years
Total shareholder return awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance unit payout							200.00%	200.00%	200.00%