Stock-Based Compensation Plans (Schedule Of Future Share-Based Compensation Cost) (Details) $ in Millions	Dec. 31, 2021 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2022	$ 35.8
2023	35.0
2024	34.3
2025	2.5
2026	0.0
Thereafter	0.0
Total	107.6
Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2022	34.8
2023	34.3
2024	34.2
2025	2.5
2026	0.0
Thereafter	0.0
Total	105.8
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2022	1.0
2023	0.7
2024	0.1
2025	0.0
2026	0.0
Thereafter	0.0
Total	1.8
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2022	0.0
2023	0.0
2024	0.0
2025	0.0
2026	0.0
Thereafter	0.0
Total	$ 0.0