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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Carrying Amount and Fair Values of the Company's Assets and Liabilities Measured on a Recurring Basis
The following table presents the carrying amount and fair values of the Company’s assets and liabilities measured on a recurring basis:
 

 
  
December 31, 2022
 
  
December 31, 2021
 
(in millions)
  
Carrying

Amount
 
  
Fair

Value
 
  
Carrying

Amount
 
  
Fair

Value
 
Assets
                                   
Non-derivatives:
                                   
Cash and cash equivalents
   $ 147.1      $ 147.1      $ 141.8      $ 141.8  
Derivatives (Level 1 measurement):
                                   
Other current and
non-current
assets:
                                   
Emissions Trading Scheme credits
     2.7        2.7        3.9        3.9  
Liabilities
                                   
Non-derivatives:
                                   
Finance leases (including current portion)
   $ —        $ —        $ 0.1      $ 0.1  
Derivatives (Level 1 measurement):
                                   
Other current liabilities:
                                   
Foreign currency forward exchange contracts
     0.5        0.5        1.2        1.2  
Non-financial
liabilities (Level 3 measurement):
                                   
Stock equivalent units
     26.4        26.4        17.3        17.3