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Intangible Assets and Goodwill Finite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2018
Sep. 30, 2017
Sep. 30, 2017
RARE Infrastructure, Ltd [Member] | Customer Contracts [Member]      
Finite-Lived Intangible Assets [Line Items]      
Change in Assets Under Management     $ 1,500,000
Impairment of Intangible Assets $ 6,400 $ 32,000  
Fair Value, Inputs, Level 3 [Member] | Asset Management Contracts      
Finite-Lived Intangible Assets [Line Items]      
Fair Value Inputs, Long-term AUM Growth Rate     7.00%
Fair Value Inputs, Attrition Rate     20.00%
Fair Value Input, Discount Rate     16.50%