XML 71 R57.htm IDEA: XBRL DOCUMENT v3.8.0.1
Commitments And Contingencies (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]    
Undrawn capital and purchase commitments $ 291.2 $ 204.1
Letter of Credit [Member]    
Loss Contingencies [Line Items]    
Estimate of possible loss $ 7.8