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Summary of Significant Accounting Policies, Foreign Currency Translation (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Foreign Currency Translation [Abstract]      
Cumulative translation adjustment related to foreign currency adjustment $ (66.4) $ (84.7) $ (71.6)
Cumulative translation adjustment related to foreign currency adjustment, tax $ 5.8 $ 13.4 $ 10.9