Commitments and Contingencies - Other Commitments (Details) - Line of Credit $ in Millions  | 
 Jun. 30, 2019  
USD ($) 
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| Long-term Commitment [Line Items] | |
| Letters of credit outstanding | $ 4.2 | 
| Letters of Credit | |
| Long-term Commitment [Line Items] | |
| Letters of credit outstanding | $ 3.7 | 
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- Definition [Line Items] for Long-Term Commitment [Table] No definition available. 
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. No definition available. 
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- Details 
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- Details 
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