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Variable Interest Entities (Details) - Variable Interest Entity, Not Primary Beneficiary [Member] - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Other investments [Member]    
Variable Interest Entity [Line Items]    
VIE interests carrying value $ 26.9 $ 26.9
Investment in unconsolidated subsidiaries [Member]    
Variable Interest Entity [Line Items]    
VIE interests carrying value $ 270.7 $ 282.3