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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
CONDENSED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) |  |  |  |
Revenues |  | $ 4,475.5 | $ 5,070.8 | $ 4,835.0
Expenses | [1] | 3,590.6 | 3,947.7 | 3,867.7
Operating income |  | 884.9 | 1,123.1 | 967.3
Gain on sale of noncontrolling interest in private company |  |  | 47.9 |
Interest income |  | 13.9 | 1.4 | 3.2
Interest expense |  | (101.0) | (105.5) | (118.5)
Other income/(expense), net |  | (37.5) | (21.7) | 3.1
Income tax benefit |  | (98.0) | (129.6) | (110.8)
Net income |  | 910.6 | 805.8 | 744.3
Other comprehensive income, net of tax |  | (115.8) | 107.4 | 49.5
Comprehensive income |  | 794.8 | 913.2 | 793.8
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 |  | 8.3 |  |
Interest expense |  | (105.7) | (115.9) | (158.5)
Other income/(expense), net |  | 3.1 | (14.7) | 3.6
Loss before equity earnings of affiliates and income taxes |  | (94.3) | (82.7) | (154.9)
Equity in earnings of affiliates, net of tax |  | 981.1 | 869.1 | 861.7
Income tax benefit |  | 23.8 | 19.4 | 37.5
Net income |  | 910.6 | 805.8 | 744.3
Other comprehensive income, net of tax |  |  | 2.5 | 0.4
Other comprehensive income/(loss) of affiliates, net of tax |  | (115.8) | 104.9 | 49.1
Comprehensive income |  | $ 794.8 | $ 913.2 | $ 793.8
[1] | As further described in Note 7, total expenses include amounts incurred with related parties of $48.8 million, $54.7 million, and $54.6 million for the years ended December 31, 2022, 2021, and 2020, respectively.

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