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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
CONDENSED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) |  |  |  |
Revenues |  | $ 5,070.8 | $ 4,835.0 | $ 5,292.1
Expenses | [1] | 3,947.7 | 3,867.7 | 4,358.1
Operating income |  | 1,123.1 | 967.3 | 934.0
Gain on divestitures of businesses (Note 5) |  |  |  | 524.6
Gain on sale of noncontrolling interest in private company |  | 47.9 |  |
Interest income |  | 1.4 | 3.2 | 6.3
Interest expense |  | (105.5) | (118.5) | (152.0)
Other income/(expense), net |  | (21.7) | 3.1 | 8.5
Income tax (expense)/benefit |  | (129.6) | (110.8) | (263.1)
Net income |  | 805.8 | 744.3 | 1,058.3
Other comprehensive income, net of tax |  | 107.4 | 49.5 | 22.0
Comprehensive income |  | 913.2 | 793.8 | 1,080.3
Parent Company | Reportable Legal Entities |  |  |  |
CONDENSED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) |  |  |  |
Gain on divestitures of businesses (Note 5) |  |  |  | 524.6
Gain on sale of noncontrolling interest in private company |  | 47.9 |  |
Interest expense |  | (115.9) | (158.5) | (181.5)
Other income/(expense), net |  | (14.7) | 3.6 | 2.7
Income/(loss) before equity earnings/(losses) of affiliates and income taxes |  | (82.7) | (154.9) | 345.8
Equity in earnings of affiliates, net of tax |  | 869.1 | 861.7 | 827.3
Income tax (expense)/benefit |  | 19.4 | 37.5 | (114.8)
Net income |  | 805.8 | 744.3 | 1,058.3
Other comprehensive income, net of tax |  | 2.5 | 0.4 | 0.2
Other comprehensive income of affiliates, net of tax |  | 104.9 | 49.1 | 21.8
Comprehensive income |  | $ 913.2 | $ 793.8 | $ 1,080.3
[1] | As further described in Note 7, total expenses include amounts incurred with related parties of $54.7 million, $54.6 million, and $57.1 million for the years ended December 31, 2021, 2020, and 2019, respectively.

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