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Summary of Significant Accounting Policies - Schedule of Fair Value, Assets Measured on Recurring Basis (Detail) - Recurring - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Assets    
Cash and cash equivalents $ 72.2 $ 148.5
Money market funds 52.2 54.4
Equity securities 2.0  
Pension assets 22.2 22.2
Total assets 171.5 244.8
Liabilities    
Total liabilities 0.0 0.0
Cash Flow Hedges    
Assets    
Derivative instruments 21.8 19.7
Warrants    
Assets    
Derivative instruments 1.1  
Level 1    
Assets    
Cash and cash equivalents 72.2 148.5
Money market funds 52.2 54.4
Equity securities 2.0  
Pension assets 14.8 14.8
Total assets 141.2 217.7
Liabilities    
Total liabilities 0.0 0.0
Level 1 | Cash Flow Hedges    
Assets    
Derivative instruments 0.0 0.0
Level 1 | Warrants    
Assets    
Derivative instruments 0.0  
Level 2    
Assets    
Cash and cash equivalents 0.0 0.0
Money market funds 0.0 0.0
Equity securities 0.0  
Pension assets 7.4 7.4
Total assets 29.2 27.1
Liabilities    
Total liabilities 0.0 0.0
Level 2 | Cash Flow Hedges    
Assets    
Derivative instruments 21.8 19.7
Level 2 | Warrants    
Assets    
Derivative instruments 0.0  
Level 3    
Assets    
Cash and cash equivalents 0.0 0.0
Money market funds 0.0 0.0
Equity securities 0.0  
Pension assets 0.0 0.0
Total assets 1.1 0.0
Liabilities    
Total liabilities 0.0 0.0
Level 3 | Cash Flow Hedges    
Assets    
Derivative instruments 0.0 $ 0.0
Level 3 | Warrants    
Assets    
Derivative instruments $ 1.1