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SCHEDULE II CONDENSED FINANCIAL INFORMATION OF REGISTRANT PARENT COMPANY ONLY (STATEMENTS OF INCOME AND COMPREHENSIVE INCOME) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Condensed Financial Statements Captions [Line Items]      
Net investment income $ 454.4 $ 372.6 $ 332.1
Net realized losses from sales and other (61.7) (84.2) (8.9)
Total revenues 6,594.4 6,237.4 5,993.5
Interest expense 43.2 34.1 34.1
Other operating expenses 692.9 686.4 607.7
Total losses and expenses 5,750.6 5,699.6 5,952.4
Income tax benefit (183.1) (112.5) (7.6)
Income from continuing operations 660.7 425.3 33.5
Net income 662.5 426.0 35.3
Other comprehensive income (loss), net of tax 284.9 60.9 184.3
Comprehensive income 947.4 486.9 219.6
The Hanover Insurance Group [Member]      
Condensed Financial Statements Captions [Line Items]      
Net investment income 21.2 10.5 11.5
Net realized losses from sales and other (0.2) (4.6) (1.1)
Other income 0.0   0.5
Total revenues 21.0 5.9 10.9
Interest expense 43.1 34.1 34.1
Employee benefit related expenses 3.9 3.4 3.9
Other operating expenses 9.9 6.5 4.8
Total losses and expenses 63.9 51.1 49.8
Net loss before income taxes and equity in income of subsidiaries (42.9) (45.2) (38.9)
Income tax benefit 13.1 12.6 10.8
Equity in income of subsidiaries 692.0 457.9 62.2
Income from continuing operations 662.2 425.3 34.1
Income from discontinued life businesses 0.3 0.7 1.2
Net income 662.5 426.0 35.3
Other comprehensive income (loss), net of tax 284.9 60.9 184.3
Comprehensive income 947.4 486.9 219.6
The Hanover Insurance Group [Member] | Related Party [Member]      
Condensed Financial Statements Captions [Line Items]      
Interest expense on loan from subsidiary $ 7.0 $ 7.1 $ 7.0