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Leases - Maturity of Lease Liabilities Under ASC 840 (Details)
$ in Millions
Jun. 30, 2019
USD ($)
Leases [Abstract]  
2020 $ 46.8
2021 45.2
2022 39.5
2023 35.9
2024 34.7
Thereafter 204.4
Total lease payments $ 406.5