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Investments Net Investment Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend $ 609.9 $ 631.0 $ 1,852.3 $ 1,882.1
Less Investment Expenses 7.3 8.4 23.6 26.8
Less Investment Income on PFA Assets 3.2 3.4 9.7 10.2
Net Investment Income 599.4 619.2 1,819.0 1,845.1
Fixed Maturity Securities        
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend 546.7 560.4 1,656.3 1,682.7
Derivatives        
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend 19.1 16.5 55.0 48.1
Mortgage Loans        
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend 25.4 27.9 77.0 84.3
Policy Loans        
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend 5.0 4.7 14.5 13.7
Equity Securities        
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend [1] 0.1 1.7 4.8 2.0
Unrealized Gain (Loss) on Securities 0.3 0.3 3.3 0.6
Private Equity Partnerships        
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend [2] 4.7 10.5 19.5 28.8
Unrealized Gain (Loss) on Securities (1.1) 2.7 2.6 8.2
Other Long-term Investments        
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend 0.2 1.4 2.8 5.0
Short-term Investments        
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend $ 8.7 $ 7.9 $ 22.4 $ 17.5
[1]
1 The net unrealized gain recognized in net investment income for the three and nine months ended September 30, 2019 related to equity securities still held at September 30, 2019 was $0.3 million and $3.3 million, respectively. The net unrealized gain recognized in net investment income for the three and nine months ended September 30, 2018 related to equity securities still held at September 30, 2018 was $0.3 million and $0.6 million, respectively.
[2]
2 The net unrealized gain (loss) recognized in net investment income for the three and nine months ended September 30, 2019 related to private equity partnerships still held at September 30, 2019 was $(1.1) million and $2.6 million, respectively. The net unrealized gain recognized in net investment income for the three and nine months ended September 30, 2018 related to private equity partnerships still held at September 30, 2018 was $2.7 million and $8.2 million, respectively.