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Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and Cash Equivalents, Fair Value $ 265.0 $ 215.6
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Debt Instrument, Fair Value 2,999.3 3,041.4
Finance Lease, Liability, Noncurrent 3.8 4.5
Unamortized debt issuance costs 4.3 5.1
Carrying Amount    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and Cash Equivalents, Fair Value 265.0 215.6
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Debt Instrument, Fair Value 3,236.6 [1] 3,234.0 [2]
Fair Value | Fair Value, Inputs, Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and Cash Equivalents, Fair Value 265.0 215.6
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Debt Instrument, Fair Value 0.0 0.0
Fair Value | Fair Value, Inputs, Level 2    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and Cash Equivalents, Fair Value 0.0 0.0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Debt Instrument, Fair Value 2,999.3 3,041.4
Fair Value | Fair Value, Inputs, Level 3    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and Cash Equivalents, Fair Value 0.0 0.0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Debt Instrument, Fair Value 0.0 0.0
Fair Value, Measurements, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, Fair Value 2.7 3.0
Liabilities, Fair Value $ 0.0 $ 0.0
[1] The carrying amount of long-term debt excluded a $3.8 million long-term finance lease obligation and $4.3 million of unamortized debt issuance costs.
[2] The carrying amount of long-term debt excluded a $4.5 million long-term finance lease obligation and $5.1 million of unamortized debt issuance costs.