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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of Financial Instruments Recorded at Fair Value
Financial Instruments Recorded at Fair Value (in millions):
December 31, 2020December 31, 2019
 Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Assets:        
Cash and cash equivalents$152.0 $— $— $152.0 $130.7 $— $— $130.7 
Deferred compensation asset (a)2.4 — — 2.4 1.8 — — 1.8 
Liabilities:        
Deferred compensation obligation (a)
$2.3 $— $— $2.3 $1.8 $— $— $1.8 
 
(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.