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Leases Minimum rental payments under non-cancellable leases with original terms in excess of one year (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 154.8
2020 151.8
2021 139.1
2022 126.2
2023 109.8
2024 and thereafter 574.6
Total minimum payments $ 1,256.3