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Investments Investment Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Net Investment Income |  |  |  |  |
Investment Income, Interest and Dividend |  | $ 571.4 | $ 574.3 | $ 1,111.2 | $ 1,133.6
Less Investment Expenses |  | 9.5 | 7.8 | 19.1 | 15.3
Less Investment Income on PFA Assets |  | 2.9 | 3.0 | 5.9 | 6.1
Net Investment Income |  | 559.0 | 563.5 | 1,086.2 | 1,112.2
Fixed Maturity Securities |  |  |  |  |
Net Investment Income |  |  |  |  |
Investment Income, Interest and Dividend |  | 467.7 | 471.4 | 923.2 | 941.2
Derivatives |  |  |  |  |
Net Investment Income |  |  |  |  |
Investment Income, Interest and Dividend |  | 15.8 | 17.7 | 30.2 | 33.9
Mortgage Loans |  |  |  |  |
Net Investment Income |  |  |  |  |
Investment Income, Interest and Dividend |  | 25.9 | 24.7 | 52.9 | 51.0
Policy Loans |  |  |  |  |
Net Investment Income |  |  |  |  |
Investment Income, Interest and Dividend |  | 5.0 | 5.0 | 9.7 | 9.8
Perpetual Preferred Securities |  |  |  |  |
Net Investment Income |  |  |  |  |
Investment Income, Interest and Dividend | [1] | (0.8) | 2.0 | 2.1 | 5.6
Private Equity Partnerships |  |  |  |  |
Net Investment Income |  |  |  |  |
Investment Income, Interest and Dividend | [2] | 53.6 | 51.9 | 86.0 | 87.8
Other Long-term Investments |  |  |  |  |
Net Investment Income |  |  |  |  |
Investment Income, Interest and Dividend |  | 1.7 | 1.3 | 3.8 | 3.4
Short-term Investments |  |  |  |  |
Net Investment Income |  |  |  |  |
Investment Income, Interest and Dividend |  | $ 2.5 | $ 0.3 | $ 3.3 | $ 0.9
[1] | The net unrealized gain (loss) recognized in net investment income for the three and six months ended June 30, 2022 related to perpetual preferred securities still held at June 30, 2022 was $(1.4) million and $1.0 million, respectively. The net unrealized gain (loss) recognized in net investment income for the three and six months ended June 30, 2021 related to perpetual preferred securities still held at June 30, 2021 was $1.5 million and $4.2 million, respectively.
[2] | The net unrealized gain recognized in net investment income for the three and six months ended June 30, 2022 related to private equity partnerships still held at June 30, 2022 was $26.9 million and $43.2 million, respectively. The net unrealized gain recognized in net investment income for the three and six months ended June 30, 2021 related to private equity partnerships still held at June 30, 2021 was $32.0 million and $59.0 million, respectively. See Note 3 for further discussion of private equity partnerships.

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