Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2025

Fair Value Disclosures [Abstract]

Schedule of financial assets and liabilities at carrying and fair value

A summary of financial assets and liabilities that are measured at fair value on a recurring basis were as follows ($ in millions):

	Quoted Prices in Active Market (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
December 31, 2025
Assets:
Investments in rabbi trust	$	9.2	$	18.3	$	—	$	27.5
Liabilities:
Cross-currency swap derivative contract	$	—	$	10.2	$	—	$	10.2
Deferred compensation plans	$	—	$	27.6	$	—	$	27.6
December 31, 2024
Assets:
Cross-currency swap derivative contract	$	—	$	5.9	$	—	$	5.9
Investments in rabbi trust	$	16.0	$	8.2	$	—	$	24.2
Liabilities:
Deferred compensation plans	$	—	$	24.2	$	—	$	24.2

	2025				2024
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Investments in rabbi trust	$	27.5	$	27.5	$	24.2	$	24.2
Cross-currency swap derivative contract	$	—	$	—	$	5.9	$	5.9
Liabilities:
Cross-currency swap derivative contract	$	10.2	$	10.2	$	—	$	—
Convertible senior notes due 2028	$	492.5	$	481.2	$	489.7	$	450.0
Convertible senior notes due 2025	$	—	$	—	$	116.0	$	125.4
Other debt	$	955.8	$	955.8	$	788.6	$	788.6