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Lease Commitments - Required Minimum Payments for Operating Leases Before Adoption of ASU 2016-02 (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 35.5
2020 36.9
2021 34.8
2022 27.7
2023 23.4
Thereafter $ 75.2