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Receivables (Receivables Sold Under The Agreement) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Receivables [Line Items]    
Fair value of deferred proceeds $ 170.0 $ 211.1
IPL [Member]    
Receivables [Line Items]    
Fair value of deferred proceeds 170.0 211.1
Receivables Sold [Member] | IPL [Member]    
Receivables [Line Items]    
Customer accounts receivable 135.2 157.6
Unbilled utility revenues 93.4 90.4
Other receivables 0.4 0.1
Receivables sold to third party 229.0 248.1
Less: cash proceeds [1] 43.0 21.0
Deferred proceeds 186.0 227.1
Less: allowance for doubtful accounts 16.0 16.0
Fair value of deferred proceeds $ 170.0 $ 211.1
[1] Changes in cash proceeds are presented in “Sales of accounts receivable” in operating activities in Alliant Energy’s and IPL’s cash flows statements.