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Goodwill and Other Intangible Assets - Future Amortization Expense (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]  
2018 $ 341.0
2019 316.4
2020 280.8
2021 251.8
2022 222.0
Thereafter $ 1,878.5