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Intangible Assets (Future Amortization Expense) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
2018 $ 1,891.6
2019 1,668.4
2020 1,570.3
2021 1,536.7
2022 $ 1,511.0