Amortizable Intangible Assets - Additional Information (Details) $ in Millions	Sep. 30, 2019 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense estimated, year one (2019)	$ 104.7
Amortization expense estimated, year two (2020)	99.8
Amortization expense estimated, year three (2021)	96.3
Amortization expense estimated, year four (2022)	91.8
Amortization expense estimated, year five (2023)	$ 84.8