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Summary of Significant Accounting Policies - Receivables Under Sales-Type Lease (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Accounting Policies [Abstract]  
2019 $ 21.2
2020 15.2
2021 10.7
2022 10.1
2023 10.2
Thereafter 8.6
Total $ 76.0