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Other Investments - Net Lease Venture (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Jun. 30, 2018
Schedule of Equity Method Investments [Line Items] |  |  |
Gain on consolidation of equity method investment |  |  | $ 67.9
Increase in noncontrolling interest from consolidation of equity method investment |  |  | $ 188.3
Other income | Net Lease Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Management fee revenue from related party |  | $ 0.6 |
Net income attributable to noncontrolling interests | Net Lease Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Management fee revenue from related party | $ 0.4 |  |
Net Lease | Net Lease Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity interest (percent) | 51.90% |  |
Equity method investment, related party ownership percentage | 0.60% |  |
Equity method investment, related party promote fee percentage | 50.00% |  |
Equity method investment, partner ownership percentage | 47.50% |  |

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