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Share-Based Compensation Plans (Textuals) (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation	$ 8.0	$ 8.0	$ 17.0	$ 16.0
Shares Awarded (in shares)			259
Stock-Based Compensation Plans (Textual) [Abstract]
Proceeds from exercise of employee stock options			$ 9.0	$ 5.0
Total intrinsic value of options exercised			7.1
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Unamortized compensation expense	9.0		$ 9.0
Weighted average period			2 years 1 month 6 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Unamortized compensation expense	30.0		$ 30.0
Weighted average period			2 years
Shares Awarded (in shares)			213
Performance Based Shares
Share-based Compensation Arrangement by Share-based Payment Award
Unamortized compensation expense	$ 16.0		$ 16.0
Weighted average period			2 years 9 months 18 days
ESG Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Shares Awarded (in shares)	100
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years

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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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