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Debt - Remaining principal payments under debt agreement (Details) - Revolving Credit Facility
$ in Millions
Mar. 31, 2020
USD ($)
Line of Credit  
Debt Instrument [Line Items]  
2020 $ 0.0
2021 0.0
2022 0.0
2023 0.0
2024 0.0
Thereafter 200.0
Term Loan  
Debt Instrument [Line Items]  
2020 0.9
2021 4.7
2022 7.5
2023 8.5
2024 8.4
Thereafter $ 120.0