Discontinued Operations - Narrative (Details) - USD ($) $ in Millions |
9 Months Ended | ||
|---|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2018 |
May 31, 2018 |
|
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | |||
| Shares converted | 0.10 | ||
| Spirit MTA REIT | Spinoff | |||
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | |||
| Cash inflows from continuing involvement subsequent to spin-off | $ 271.2 | $ 13.0 | |
| Cash outflows from continuing involvement subsequent to spin-off | $ 49.8 | $ 28.8 | |