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Credit Agreements - Schedule of Debt Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Sep. 30, 2019
Apr. 03, 2018
Debt Instrument [Line Items]      
Principal $ 825.0 $ 825.0  
Debt Issuance Costs, Net (5.8) (6.0)  
Debt, Net 819.2 819.0  
Senior Term Loan      
Debt Instrument [Line Items]      
Principal 275.0 275.0  
Debt Issuance Costs, Net (0.6) (0.6)  
Debt, Net 274.4 274.4 $ 325.0
5.375% Senior Notes due March 2025      
Debt Instrument [Line Items]      
Principal 250.0 250.0  
Debt Issuance Costs, Net (1.9) (2.0)  
Debt, Net 248.1 248.0  
4.600% Senior Notes Due May 2028      
Debt Instrument [Line Items]      
Principal 300.0 300.0  
Debt Issuance Costs, Net (3.3) (3.4)  
Debt, Net $ 296.7 $ 296.6