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Share-Based Compensation Plans (Textuals) (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation	$ 9.0	$ 8.0	$ 18.0	$ 17.0
Shares Awarded (in shares)			306
Stock-Based Compensation Plans (Textual) [Abstract]
Proceeds from exercise of employee stock options			$ 3.0	$ 9.0
Total intrinsic value of options exercised			2.1
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Unamortized compensation expense	9.0		$ 9.0
Weighted average period			2 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Unamortized compensation expense	35.0		$ 35.0
Weighted average period			2 years 1 month 6 days
Shares Awarded (in shares)			323
Performance Based Shares
Share-based Compensation Arrangement by Share-based Payment Award
Unamortized compensation expense	$ 17.0		$ 17.0
Weighted average period			2 years 4 months 24 days

X

- 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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Amount of cost to be recognized for option under share-based payment arrangement.

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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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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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Stock-based compensation plans.

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