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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2022
Fair Value Disclosures [Abstract]  
Schedule of Financial Instruments Recorded at Fair Value
Financial Instruments Recorded at Fair Value (in millions):
March 31, 2022December 31, 2021
 Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Assets:        
Cash and cash equivalents$168.5 $— $— $168.5 $193.8 $— $— $193.8 
Deferred compensation asset (a)3.0 — — 3.0 3.2 — — 3.2 
Liabilities:  
Deferred compensation obligation (a)$3.0 $— $— $3.0 $3.2 $— $— $3.2 
 
(a)    The deferred compensation obligation represents the balance of deferred compensation plus net investment earnings. The deferred compensation plan is funded through a rabbi trust. Trust funds are invested in mutual funds for which unit prices are quoted in active markets and are classified within Level 1 of the valuation hierarchy.