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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2024
Fair Value Disclosures [Abstract]  
Schedule of Assets (Liabilities) Measured at Fair Value on a Recurring Basis
Assets (liabilities) measured at fair value on a recurring basis are as follows (dollars in millions):
Fair Value Measurement UsingBalance Sheet LocationJune 30,
2024
December 31, 2023
Quoted prices in active markets for identical assets (Level 1)Marketable Securities$17.2 $23.5 
Significant other observable inputs (Level 2)Other current assets / (Accrued liabilities)3.2 (4.1)