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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2022
Fair Value Disclosures [Abstract]  
Fair Value, Liabilities Measured on Recurring Basis Below is a summary of financial assets and liabilities that are measured at fair value on a recurring basis as of:
($ in millions)Quoted Prices
in Active
Market
(Level 1)
Significant Other
Observable Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Total
September 30, 2022
Equity securities measured at fair value$67.1 $— $— $67.1 
Earn-out liabilities— — 14.0 14.0 
Deferred compensation liabilities— 4.9 — 4.9 
December 31, 2021
Deferred compensation liabilities$— $4.8 $— $4.8