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Credit Agreements - Schedule of Debt Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Sep. 30, 2021
Apr. 03, 2018
Debt Instrument [Line Items]      
Principal $ 825.0 $ 825.0  
Debt Issuance Costs, Net (6.0) (6.2)  
Debt, Net 819.0 818.8  
Senior Term Loan      
Debt Instrument [Line Items]      
Principal 225.0 225.0  
Debt Issuance Costs, Net (0.2) (0.2)  
Debt, Net 224.8 224.8 $ 325.0
4.600% Senior Notes due May 2028      
Debt Instrument [Line Items]      
Principal 300.0 300.0  
Debt Issuance Costs, Net (2.5) (2.6)  
Debt, Net 297.5 297.4  
3.100% Senior Notes due March 2030      
Debt Instrument [Line Items]      
Principal 300.0 300.0  
Debt Issuance Costs, Net (3.3) (3.4)  
Debt, Net $ 296.7 $ 296.6