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Leases - Future Minimum Payments (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Minimum future rental payments required under operating leases  
2019 $ 222.5
2020 220.5
2021 217.4
2022 216.0
2023 212.0
2024 and thereafter 4,344.4
Total $ 5,432.8