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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Cumulative foreign currency translation | $ (350.9) | $ (345.7) |
Unrecognized pension costs (net of tax benefit of $8.9 in 2023 and $9.9 in 2022) | (28.8) | (34.4) |
Unrealized gain on cash flow hedges (net of tax (benefit) expense of $(1.2) in 2023 and $2.8 in 2022) | 10.3 | 13.6 |
Total accumulated other comprehensive income (loss) | (369.4) | (366.5) |
Unrecognized pension costs, tax benefit | 8.9 | 9.9 |
Unrealized gain on cash flow hedges, tax (benefit) expense | (1.2) | 2.8 |
Foreign currency translation adjustment [Abstract] |  |  |
Foreign currency translation adjustment, pre-tax amount | (6.1) | (78.9) | $ (78.9)
Foreign currency translation adjustment, tax (expense) benefit | 0.0 | 0.0 | 0.0
Foreign currency translation adjustments, net-of-tax amount | (6.1) | (78.9) | (78.9)
Pension plans [Abstract] |  |  |
Net actuarial gains (losses) and prior service costs arising during the period, pre-tax amount | 5.1 | 41.4 | 49.3
Net actuarial gains (losses) and prior service costs arising during the period, tax (expense) benefit | (1.4) | (9.8) | (12.5)
Net actuarial gains (losses) and prior service costs arising during the period, net-of-tax amount | 3.7 | 31.6 | 36.8
Amortization of net actuarial (gains) losses and prior service costs, pre-tax amount | 2.5 | 4.9 | 11.3
Amortization of net actuarial (gains) losses and prior service costs, tax (expense) benefit | (0.6) | (1.2) | (2.9)
Amortization of net actuarial (gains) losses and prior service costs, net-of-tax amount | 1.9 | 3.7 | 8.4
Unrealized gains (losses) on cash flow hedges [Abstract] |  |  |
Unrealized gains (losses) on cash flow hedges, pre-tax amount | (4.5) | 10.6 | 11.4
Unrealized gains (losses) on cash flow hedges, tax (expense) benefit | 1.2 | (2.8) | (3.0)
Unrealized gains (losses) on cash flow hedges, net-of-tax amount | (3.3) | 7.8 | 8.4
Total other comprehensive income (loss), pre-tax amount | (3.0) | (22.0) | (6.9)
Total other comprehensive income (loss), tax | (0.8) | (13.8) | (18.4)
Total other comprehensive loss, net of tax | $ (3.8) | $ (35.8) | $ (25.3)

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