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Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2022
Accounting Policies [Abstract]  
Schedule of Other Current Assets The components of other current assets consist of the following (in millions):
Successor
March 31, 2022December 31, 2021
Prepaid insurance$3.1 $5.3 
Short-term marketable securities4.7 4.9 
Income tax receivable1.0 2.8 
Other current assets20.0 18.5 
$28.8 $31.5