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Summary of Significant Accounting Policies - Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) - Measured on a Recurring Basis - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Assets:    
Derivative assets $ 219.1 $ 218.5
Total assets 290.1 685.8
Liabilities:    
Derivative liabilities 1.2 4.9
Total liabilities 1.2 4.9
Commercial paper and other    
Assets:    
Cash and cash equivalents   120.0
Time deposits    
Assets:    
Cash and cash equivalents 71.0 347.3
Level 1    
Assets:    
Derivative assets 0.0 0.0
Total assets 71.0 347.3
Liabilities:    
Derivative liabilities 0.0 0.0
Total liabilities 0.0 0.0
Level 1 | Commercial paper and other    
Assets:    
Cash and cash equivalents   0.0
Level 1 | Time deposits    
Assets:    
Cash and cash equivalents 71.0 347.3
Level 2    
Assets:    
Derivative assets 219.1 218.5
Total assets 219.1 338.5
Liabilities:    
Derivative liabilities 1.2 4.9
Total liabilities 1.2 4.9
Level 2 | Commercial paper and other    
Assets:    
Cash and cash equivalents   120.0
Level 2 | Time deposits    
Assets:    
Cash and cash equivalents 0.0 0.0
Level 3    
Assets:    
Derivative assets 0.0 0.0
Total assets 0.0 0.0
Liabilities:    
Derivative liabilities 0.0 0.0
Total liabilities 0.0 0.0
Level 3 | Commercial paper and other    
Assets:    
Cash and cash equivalents   0.0
Level 3 | Time deposits    
Assets:    
Cash and cash equivalents $ 0.0 $ 0.0