XML 73 R56.htm IDEA: XBRL DOCUMENT v3.22.0.1
Net Investment Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Gross investment income $ 78.1 $ 81.8 $ 92.7
Investment expenses (5.4) (5.5) (4.6)
Net investment income 72.7 76.3 88.1
Debt Securities [Member]      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income related to fixed maturity securities and short-term investments and cash equivalents 71.5 72.6 81.9
Equity Securities [Member]      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income related to equity securities 3.7 4.4 7.9
Other Investments [Member]      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income related to fixed maturity securities and short-term investments and cash equivalents 2.7 2.8 1.2
Short-term Investments [Member]      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income related to fixed maturity securities and short-term investments and cash equivalents 0.2 1.5 0.0
Cash and Cash Equivalents [Member]      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income related to fixed maturity securities and short-term investments and cash equivalents $ 0.0 $ 0.5 $ 1.7