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Goodwill and Other Intangible Assets Future amortization expense (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2017 $ 339.5
2018 324.6
2019 299.7
2020 266.0
2021 237.5
Thereafter $ 1,929.5