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Business Combinations (Details)
£ in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2018
GBP (£)
Jul. 01, 2018
USD ($)
Apr. 12, 2018
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Business Acquisition [Line Items]                
Business Acquisition, Date of Acquisition Agreement     Apr. 12, 2018          
Business Acquisition, Effective Date of Acquisition Jul. 01, 2018 Jul. 01, 2018            
Business Acquisition, Percentage of Voting Interests Acquired 60.00% 60.00%            
Payments to Acquire Businesses, Gross £ 259,900 $ 343,300            
Proceeds from New Borrowings         $ 18,000   $ 18,000 $ 0
Business Acquisition, Transaction Costs         4,600   4,600  
Business Combination, Acquisition Related Costs             $ 2,800  
Foreign Currency Transaction Gain (Loss), Realized         $ 1,700      
BT Pension Scheme [Member]                
Business Acquisition [Line Items]                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 29.50% 29.50%            
Hermes Management [Member]                
Business Acquisition [Line Items]                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 10.50% 10.50%            
Acquisition Cost [Member]                
Business Acquisition [Line Items]                
Payments to Acquire Businesses, Gross | £ £ 246,000              
Excess Regulatory Capital [Member]                
Business Acquisition [Line Items]                
Payments to Acquire Businesses, Gross | £ £ 13,900              
Scenario, Forecast [Member]                
Business Acquisition [Line Items]                
Business Combination, Acquisition Related Costs       $ 11,000   $ 16,000