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Schedule I - Condensed Financial Information of the Registrant - Condensed Statements of Income and Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
CONDENSED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) |  |  |  |
Revenues |  | $ 4,357.0 | $ 4,475.5 | $ 5,070.8
Expenses | [1] | 3,539.5 | 3,590.6 | 3,947.7
Operating income |  | 817.5 | 884.9 | 1,123.1
Gain on sale of noncontrolling interest in private company |  |  |  | 47.9
Interest income |  | 15.6 | 13.9 | 1.4
Interest expense |  | (105.3) | (101.0) | (105.5)
Other income/(expense), net |  | 0.0 | (37.5) | (21.7)
Income tax benefit |  | (119.8) | (98.0) | (129.6)
Net income |  | 626.0 | 910.6 | 805.8
Other comprehensive income, net of tax |  | 0.6 | (115.8) | 107.4
Comprehensive income |  | 626.6 | 794.8 | 913.2
Parent Company | Reportable Legal Entities |  |  |  |
CONDENSED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) |  |  |  |
Gain on sale of noncontrolling interest in private company |  |  |  | 47.9
Interest income |  | 1.2 | 8.3 |
Interest expense |  | (121.5) | (105.7) | (115.9)
Other income/(expense), net |  |  | 3.1 | (14.7)
Loss before equity earnings of affiliates and income taxes |  | (120.3) | (94.3) | (82.7)
Equity in earnings of affiliates, net of tax |  | 720.6 | 981.1 | 869.1
Income tax benefit |  | 25.7 | 23.8 | 19.4
Net income |  | 626.0 | 910.6 | 805.8
Other comprehensive income, net of tax |  | 0.3 |  | 2.5
Other comprehensive income/(loss) of affiliates, net of tax |  | 0.3 | (115.8) | 104.9
Comprehensive income |  | $ 626.6 | $ 794.8 | $ 913.2
[1] | As further described in Note 6, total expenses include amounts incurred with related parties of $45.4 million, $48.8 million, and $54.7 million for the years ended December 31, 2023, 2022, and 2021, respectively.

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