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Accumulated Other Comprehensive Loss - Changes in accumulated other comprehensive loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Currency translation adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ (17.7) $ (16.2) $ (17.0)
Other comprehensive income (loss), net of tax, before reclassifications 1.3 (1.5) 0.8
Amounts reclassified from accumulated other comprehensive loss, current period, net of tax 0.0 0.0 0.0
Amounts reclassified from accumulated other comprehensive loss, tax expense (benefit) (0.0) (0.0) (0.0)
Other comprehensive income (loss) 1.3 (1.5) 0.8
Ending balance (16.4) (17.7) (16.2)
Unrealized loss on derivative financial instrument      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance 0.0 0.0 1.3
Other comprehensive income (loss), net of tax, before reclassifications 0.0 0.0 0.1
Amounts reclassified from accumulated other comprehensive loss, current period, net of tax 0.0 0.0 (1.4)
Amounts reclassified from accumulated other comprehensive loss, tax expense (benefit) (0.0) (0.0) 0.4
Other comprehensive income (loss) 0.0 0.0 (1.3)
Ending balance 0.0 0.0 0.0
Accumulated other comprehensive loss      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (17.7) (16.2) (15.7)
Other comprehensive income (loss), net of tax, before reclassifications 1.3 (1.5) 0.9
Amounts reclassified from accumulated other comprehensive loss, current period, net of tax 0.0 0.0 (1.4)
Amounts reclassified from accumulated other comprehensive loss, tax expense (benefit) (0.0) (0.0) 0.4
Other comprehensive income (loss) 1.3 (1.5) (0.5)
Ending balance $ (16.4) $ (17.7) $ (16.2)