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Subsequent Events (Details) - Subsequent Event - USD ($) $ in Millions | Jul. 02, 2018 | Jul. 01, 2018
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Sustainable Growth Advisers, LP |  |
Subsequent Event [Line Items] |  |
Term loan debt drawn at closing | $ 105.0 |
Sustainable Growth Advisers, LP |  |
Subsequent Event [Line Items] |  |
Assets under management |  | $ 11,300.0

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