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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss), net of tax beginning balance | $ (146.0) | $ (172.8) | $ (153.7) | $ (164.9)
Balance, January 1, 2018 | (145.7) | (159.3) | (145.7) | (159.3)
Other comprehensive income (loss), before reclassifications, net of tax | (7.8) | 0.9 | 2.8 | 10.0
Amounts reclassified from accumulated other comprehensive income, net of tax | 8.1 | 12.6 | 5.2 | (4.4)
Other comprehensive income (loss), net of tax | 0.3 | 13.5 | 8.0 | 5.6
Accumulated other comprehensive income (loss), net of tax ending balance | (145.7) | (159.3) | (145.7) | (159.3)
Other comprehensive income (loss), net of tax | 0.3 | 13.5 | 8.0 | 5.6
Gains (losses) on securities available for sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss), net of tax beginning balance | 9.8 | (14.5) | (25.0) | (15.7)
Balance, January 1, 2018 | (31.2) | 0.0 | (31.2) | 0.0
Other comprehensive income (loss), before reclassifications, net of tax | (49.1) | 2.5 | (11.4) | 2.3
Amounts reclassified from accumulated other comprehensive income, net of tax | 8.1 | 12.0 | 5.2 | 13.4
Other comprehensive income (loss), net of tax | (41.0) | 14.5 | (6.2) | 15.7
Accumulated other comprehensive income (loss), net of tax ending balance | (31.2) | 0.0 | (31.2) | 0.0
Gains (losses) on cash flow hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss), net of tax beginning balance | (2.7) | (13.4) | (2.6) | 15.1
Balance, January 1, 2018 | (2.4) | 16.2 | (2.4) | 16.2
Other comprehensive income (loss), before reclassifications, net of tax | 0.3 | 29.0 | 0.2 | 18.9
Amounts reclassified from accumulated other comprehensive income, net of tax | 0.0 | 0.6 | 0.0 | (17.8)
Other comprehensive income (loss), net of tax | 0.3 | 29.6 | 0.2 | 1.1
Accumulated other comprehensive income (loss), net of tax ending balance | (2.4) | 16.2 | (2.4) | 16.2
Unfunded status of postretirement benefit plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss), net of tax beginning balance |  | (0.4) |  | (1.1)
Balance, January 1, 2018 |  | (0.5) |  | (0.5)
Other comprehensive income (loss), before reclassifications, net of tax |  | (0.1) |  | 0.6
Amounts reclassified from accumulated other comprehensive income, net of tax |  | 0.0 |  | 0.0
Other comprehensive income (loss), net of tax |  | (0.1) |  | 0.6
Accumulated other comprehensive income (loss), net of tax ending balance |  | (0.5) |  | (0.5)
Currency translation adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss), net of tax beginning balance | (153.1) | (144.5) | (126.1) | (163.2)
Balance, January 1, 2018 | (112.1) | (175.0) | (112.1) | (175.0)
Other comprehensive income (loss), before reclassifications, net of tax | 41.0 | (30.5) | 14.0 | (11.8)
Amounts reclassified from accumulated other comprehensive income, net of tax | 0.0 | 0.0 | 0.0 | 0.0
Other comprehensive income (loss), net of tax | 41.0 | (30.5) | 14.0 | (11.8)
Accumulated other comprehensive income (loss), net of tax ending balance | $ (112.1) | $ (175.0) | $ (112.1) | $ (175.0)

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