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Intangible Assets And Goodwill (Future Estimated Amortization Expense) (Details)
$ in Millions
Mar. 31, 2021
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Remainder of 2021 $ 174.8
2022 233.1
2023 231.7
2024 225.0
2025 225.0
2026 225.0
Thereafter $ 1,952.2