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Segment Information - Reconciliation of Segment Operating Revenues and Earnings to Consolidated (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |
Net realized capital gains (losses), net of related revenue adjustments | $ 132.3 | $ 83.7
Total revenues | 4,551.3 | 3,743.9
Pre-tax net realized capital gains (losses), as adjusted | (67.1) | 65.6
Income (loss) before income taxes | 328.2 | 526.0
Retirement and Income Solutions |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |
Inter-segment revenues | 84.0 | 85.7
Principal Global Investors |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |
Inter-segment revenues | 72.7 | 61.5
Operating Segments |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |
Operating revenues | 4,429.6 | 3,680.7
Pre-tax operating earnings (losses) | 386.0 | 478.7
Operating Segments | Retirement and Income Solutions |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |
Operating revenues | 2,605.7 | 1,891.9
Pre-tax operating earnings (losses) | 205.1 | 240.6
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Fee |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |
Operating revenues | 543.1 | 430.8
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Spread |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |
Operating revenues | 2,062.6 | 1,461.1
Operating Segments | Principal Global Investors |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |
Operating revenues | 390.8 | 339.0
Pre-tax operating earnings (losses) | 111.7 | 100.7
Operating Segments | Principal International |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |
Operating revenues | 300.5 | 380.5
Pre-tax operating earnings (losses) | 30.8 | 111.1
Operating Segments | U.S. Insurance Solutions |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |
Operating revenues | 1,123.3 | 1,068.1
Pre-tax operating earnings (losses) | 129.5 | 110.7
Operating Segments | U.S. Insurance Solutions | Specialty Benefits insurance |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |
Operating revenues | 639.0 | 601.8
Operating Segments | U.S. Insurance Solutions | Individual Life insurance |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |
Operating revenues | 484.3 | 466.3
Operating Segments | Corporate |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |
Operating revenues | 9.3 | 1.2
Pre-tax operating earnings (losses) | (91.1) | (84.4)
Reconciling Items |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |
Net realized capital gains (losses), net of related revenue adjustments | 132.3 | 83.7
Adjustments related to equity method investments | (10.6) | (20.5)
Pre-tax net realized capital gains (losses), as adjusted | (67.1) | 65.6
Earnings adjustments related to equity method investments and noncontrolling interest | $ 9.3 | $ (18.3)

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- Definition Operating revenues is a measure of revenue for the operating segments. It is derived by adjusting total revenues for net realized capital gains and losses (except periodic settlements and accruals on derivatives not designated as hedging instruments), including their impact on recognition of front-end fee revenues, certain market value adjustments to fee revenues and amortization of hedge accounting book value adjustments for certain discontinued hedges, and revenue from the exited group medical insurance business. Operating revenues also includes operating revenues from real estate properties that qualify for discontinued operations. + References No definition available. + Details
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