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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 |  |

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- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
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- Definition Date when the business acquisition agreement was executed, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e848-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e845-128460 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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