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Goodwill and Intangible Assets (Summary Of Amortization Expense) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2017 $ 112.8
2018 94.5
2019 87.7
2020 72.4
2021 59.7
Thereafter 195.2
Total estimated amortization expense $ 622.3