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Investments - Provision for Credit Losses (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Investment Grade  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Origination for gross loan and financing receivables in 2019 $ 88.7
Origination for gross loan and financing receivables in 2018 29.7
Origination for gross loan and financing receivables in 2017 0.0
Origination for gross loan and financing receivables in 2016 and prior 80.5
Non Investment Grade  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Origination for gross loan and financing receivables in 2019 162.5
Origination for gross loan and financing receivables in 2018 46.2
Origination for gross loan and financing receivables in 2017 13.2
Origination for gross loan and financing receivables in 2016 and prior 163.9
ASU 2016-13  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Provisions to allowance for credit losses 0.0
Write-offs charged against allowance 0.0
Recoveries of amounts previously written off 0.0
ASU 2016-13 | Investment Grade  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Loans and financing receivables 198.9
ASU 2016-13 | Non Investment Grade  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Loans and financing receivables $ 385.8