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Goodwill and Other Intangible Assets - Expected Intangible Asset Amortization Expense (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 $ 5.9
2020 19.5
2021 5.6
2022 3.8
2023 3.6
Thereafter 8.4
Amortizing intangible assets, net carrying amount $ 46.8