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Parent's Equity - Summary of Parents Equity (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2022
Mar. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance $ 550.5 $ 594.3 $ 585.8 $ 572.2 $ 594.3 $ 572.2
Net Income 79.6 98.8 107.9 105.3 178.4 213.2
Foreign currency translation (7.1) (8.8) (3.8) 0.1 (15.9) (3.7)
Net transfers to Parent (1,590.5) (133.8) (109.2) (91.8) (1,724.3) (201.0)
Ending balance (967.5) 550.5 580.7 585.8 (967.5) 580.7
Net Parent Investment            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 829.8 864.8 847.3 833.8 864.8 833.8
Net Income 79.6 98.8 107.9 105.3    
Net transfers to Parent (1,590.5) (133.8) (109.2) (91.8)    
Ending balance (681.1) 829.8 846.0 847.3 (681.1) 846.0
Accumulated Other Comprehensive Loss            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance (279.3) (270.5) (261.5) (261.6) (270.5) (261.6)
Foreign currency translation (7.1) (8.8) (3.8) 0.1    
Ending balance $ (286.4) $ (279.3) $ (265.3) $ (261.5) $ (286.4) $ (265.3)