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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%