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Schedule II Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Cash flows from operating activities |  |  |  |  |
Net income | $ 102.8 | $ 45.0 |  | $ 19.8 | [1]
Changes in: |  |  |  |  |
Other operating assets and liabilities | 101.4 | 53.9 |  | (109.4) | [2]
Net cash provided by operating activities | 452.1 | 302.1 |  | 171.5 | [2]
Cash flows from investing activities |  |  |  |  |
Purchase of equity securities | (4.5) | (2.5) |  | (5.2) | [2]
Purchase of limited partnership interests | (74.8) | (207.2) |  | (356.4) | [2]
Other, net | 7.2 | 9.2 |  | (9.6) | [2]
Acquisition of business, net of cash acquired | 0.0 | 0.0 |  | (164.4) | [2]
Net cash used in investing activities | (135.8) | (107.4) |  | (214.6) | [2]
Cash flows from financing activities |  |  |  |  |
Dividends paid to shareholders | (55.5) | (53.9) |  | (52.6) | [2]
Proceeds from issuance of 2023 Senior Notes due 2028 | 0.0 | 297.7 |  | 0.0 | [2]
Principal repayment on Revolving Credit Facility | 0.0 | (249.0) |  | 0.0 | [2]
Proceeds from exercise of stock options | 5.1 | 0.0 |  | 0.0 | [2]
Withholding tax payments on RSUs tendered | (1.8) | (1.8) |  | (2.4) | [2]
Net cash used in financing activities | (307.9) | (207.8) |  | (47.8) | [2]
Net increase (decrease) in cash | 8.4 | (13.1) |  | (90.9) | [2]
Cash at beginning of year | 29.7 | 42.8 | [2] | 133.7 | [2]
Cash at end of year | 38.1 | 29.7 |  | 42.8 | [2]
Parent company |  |  |  |  |
Cash flows from operating activities |  |  |  |  |
Net income | 102.8 | 45.0 |  | 19.8 |
Equity in net income of subsidiaries | (135.8) | (72.7) |  | (41.3) |
Dividends received from subsidiaries | 120.2 | 132.1 |  | 184.3 |
Changes in: |  |  |  |  |
Income taxes | 15.5 | (5.8) |  | 3.9 |
Other operating assets and liabilities | (8.1) | 6.0 |  | 0.8 |
Other | 2.0 | 1.2 |  | (1.5) |
Net cash provided by operating activities | 96.6 | 105.8 |  | 166.0 |
Cash flows from investing activities |  |  |  |  |
Purchase of equity securities | (1.2) | 0.0 |  | 0.0 |
Purchase of limited partnership interests | (28.9) | 0.0 |  | 0.0 |
Other, net | (12.0) | (1.3) |  | (0.7) |
Capital contributions to subsidiaries | (2.0) | (98.0) |  | (35.0) |
Acquisition of business, net of cash acquired | 0.0 | 0.0 |  | (172.3) |
Net cash used in investing activities | (44.1) | (99.3) |  | (208.0) |
Cash flows from financing activities |  |  |  |  |
Dividends paid to shareholders | (55.6) | (53.9) |  | (52.6) |
Proceeds from issuance of 2023 Senior Notes due 2028 | 0.0 | 296.5 |  | 0.0 |
Principal repayment on Revolving Credit Facility | 0.0 | (249.0) |  | 0.0 |
Acquisition of treasury stock | (8.6) | (6.5) |  | (24.0) |
Proceeds from exercise of stock options | 5.1 | 0.0 |  | 0.0 |
Withholding tax payments on RSUs tendered | (1.8) | (1.8) |  | (2.4) |
Proceeds for Share-based compensation | 8.4 | 8.0 |  | 7.1 |
Net cash used in financing activities | (52.5) | (6.7) |  | (71.9) |
Net increase (decrease) in cash | 0.0 | (0.2) |  | (113.9) |
Cash at beginning of year | 0.1 | 0.3 |  | 114.2 |
Cash at end of year | $ 0.1 | $ 0.1 |  | $ 0.3 |
[1] | Recast for the adoption of ASU 2018-12.
[2] | Recast for the adoption of ASU 2018-12.

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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
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