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Revenue - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020
Revenue from Contract with Customer [Abstract] |  |  |  |  |  |
Advance Medicare payments to provide relief from economic impacts of COVID-19 |  |  |  |  |  | $ 29,700,000
Revenue increase (decrease) due to changes in estimated transaction price due to contractual adjustments | $ 7,600,000 |  |  | $ 16,600,000 |  |
Revenue recognized due to expanded local coverage determination for which revenue was previously constrained |  | $ 6,800,000 |  |  |  |
Capitalized costs incurred to obtain or fulfill contract | $ 0 |  |  | $ 0 |  |
Performance obligation estimate |  |  |  |  |  |
Revenue and Concentration Risk [Line Items] |  |  |  |  |  |
Change in earnings per share (dollars per share) | $ 0.07 |  |  | $ 0.16 |  |
Revenues | Customer concentration | Medicare |  |  |  |  |  |
Revenue and Concentration Risk [Line Items] |  |  |  |  |  |
Concentration risk (percent) | 17.00% |  | 16.00% | 17.00% | 15.00% |

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