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Investments Investment Income (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net Investment Income      
Investment Income, Interest and Dividend $ 2,260.6 $ 2,403.7 $ 2,480.2
Less Investment Expenses 35.1 30.6 32.1
Less Investment Income on PFA Assets 12.3 12.4 12.8
Net Investment Income 2,213.2 2,360.7 2,435.3
Fixed Maturity Securities      
Net Investment Income      
Investment Income, Interest and Dividend 1,888.2 2,164.0 2,213.6
Derivatives      
Net Investment Income      
Investment Income, Interest and Dividend 68.6 78.7 73.4
Mortgage Loans      
Net Investment Income      
Investment Income, Interest and Dividend 105.0 108.9 103.3
Policy Loans      
Net Investment Income      
Investment Income, Interest and Dividend 19.7 20.0 19.9
Perpetual Preferred Securities      
Net Investment Income      
Investment Income, Interest and Dividend [1] 6.9 (2.1) 5.4
Private Equity Partnerships      
Net Investment Income      
Investment Income, Interest and Dividend [2] 165.4 19.8 31.7
Other Long-term Investments      
Net Investment Income      
Investment Income, Interest and Dividend 5.5 3.9 3.9
Short-term Investments      
Net Investment Income      
Investment Income, Interest and Dividend $ 1.3 $ 10.5 $ 29.0
[1] The net unrealized gain (loss) recognized in net investment income for the year ended December 31, 2021 related to perpetual preferred securities still held at December 31, 2021 was $4.4 million. The net unrealized gain (loss) recognized in net investment income for the years ended December 31, 2020 and 2019 related to perpetual preferred securities still held at year-end was $(4.6) million and $3.3 million, respectively
[2] The net unrealized gain (loss) recognized in net investment income for the year ended December 31, 2021 related to private equity partnerships still held at December 31, 2021 was $107.8 million. The net unrealized gain (loss) recognized in net investment income for the years ended December 31, 2020 and 2019 related to private equity partnerships still held at year-end was $(8.7) million and $6.8 million, respectively. See Note 2 for further discussion of private equity partnerships.