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Net Investment Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend $ 631.0 $ 619.6 $ 1,882.1 $ 1,866.5
Less Investment Expenses 8.4 7.1 26.8 24.0
Less Investment Income on PFA Assets 3.4 3.5 10.2 10.6
Net Investment Income 619.2 609.0 1,845.1 1,831.9
Fixed Maturity Securities        
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend 560.4 564.8 1,682.7 1,700.5
Derivatives        
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend 16.5 14.4 48.1 41.8
Mortgage Loans        
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend 27.9 25.8 84.3 76.8
Policy Loans        
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend 4.7 4.5 13.7 13.3
Equity Securities        
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend 1.7 [1] 0.4 2.0 [1] 1.0
Private Equity Partnerships        
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend 10.5 [2] 3.7 28.8 [2] 17.3
Other Long-term Investments        
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend 1.4 2.5 5.0 7.8
Short-term Investments        
Schedule of Investment Income, Reported Amounts, by Category        
Investment Income, Interest and Dividend $ 7.9 $ 3.5 $ 17.5 $ 8.0
[1] The net unrealized loss 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] 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.