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Shareholders' Equity
 3 Months Ended
Mar. 31, 2024
Stockholders' Equity Note [Abstract]  
Shareholders' Equity Shareholders' Equity
Accumulated Other Comprehensive Loss
The changes in components of accumulated other comprehensive loss, net of tax, are as follows:
Three Months Ended March 31, 2024
Foreign Currency
Translation
Adjustments		Pension and Post-
Retirement Medical
Benefits		Derivative Financial InstrumentsTotal
Beginning balance$(45.6)$3.7 $(0.4)$(42.3)
Other comprehensive (loss) income before reclassifications(8.0)— 1.6 (6.4)
Amounts reclassified from accumulated other comprehensive loss(0.2)— (0.6)(0.8)
Net current period other comprehensive income(8.2)— 1.0 (7.2)
Ending balance$(53.8)$3.7 $0.6 $(49.5)
Three Months Ended March 31, 2023
Foreign Currency
Translation
Adjustments		Pension and Post-
Retirement Medical
Benefits		Derivative Financial InstrumentsTotal
Beginning balance$(53.9)$2.7 $1.0 $(50.2)
Other comprehensive income (loss) before reclassifications5.5 — (0.2)5.3 
Amounts reclassified from accumulated other comprehensive loss(0.2)— (0.4)(0.6)
Net current period other comprehensive income (loss)5.3 — (0.6)4.7 
Ending balance$(48.6)$2.7 $0.4 $(45.5)