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Fair Value Measurements Fair Value, Balance Sheet Grouping (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, Gross, Insurance Policy $ 298.0 $ 298.6
Loans Receivable, Fair Value Disclosure 519.6 560.3
Short-term Investments at Cost which Approximates Fair Value 688.5 235.5
Cash and Cash Equivalents, Fair Value Disclosure 688.5 235.5
Debt, Current and Non-current, at Amortized Cost (Fair Value: 2018 - $1,127.7; 2017 - $614.6) 1,123.7 592.3
Long-term Debt, Fair Value 1,127.7 614.6
Federal Home Loan Bank of Chicago [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances 10.0 0.0
Federal Home Loan Bank Borrowings, Fair Value Disclosure $ 10.0 $ 0.0