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Debt - Revolving Letter of Credit Facility (Details)
$ in Millions
Sep. 30, 2019
USD ($)
letter_of_credit
Revolving Letter of Credit Facility  
Debt Instrument [Line Items]  
Number of letters of credit | letter_of_credit 6
Amount outstanding | $ $ 9.4
Letter of Credit Arrangement  
Debt Instrument [Line Items]  
Number of letters of credit | letter_of_credit 2
Amount outstanding | $ $ 20.4