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Share-Based Compensation Plans (Textuals) (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation	$ 12.0	$ 9.0
Shares Awarded (in shares)	227
Commons tock available for future awards (in shares)	3,000
Stock-Based Compensation Plans (Textual) [Abstract]
Proceeds from exercise of employee stock options	$ 7.0	$ 1.0
Total intrinsic value of options exercised	7.0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Unamortized compensation expense	$ 10.0
Weighted average period	2 years 3 months 18 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Unamortized compensation expense	$ 41.0
Weighted average period	2 years 3 months 18 days
Shares Awarded (in shares)	259
Performance Based Shares
Share-based Compensation Arrangement by Share-based Payment Award
Unamortized compensation expense	$ 21.0
Weighted average period	2 years 4 months 24 days

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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-Publisher FASB
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The number of grants made 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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Stock-based compensation plans.

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