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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On July 1, 2018 the Company closed on its majority investment in Sustainable Growth Advisers, an investment manager with $11.3 billion in assets under management at June 30, 2018. The transaction was financed with balance sheet resources and $105.0 million of term loan debt, which was drawn at the closing.