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Parent's Equity
 6 Months Ended
Mar. 31, 2022
Stockholders' Equity Note [Abstract]  
Parent's Equity Parent’s Equity
Changes in certain components of Parent’s Equity were as follows:
 
Net Parent
Investment
Accumulated
Other
Comprehensive
Loss
Total Parent’s
Equity
Balance, October 1, 2021$864.8 $(270.5)$594.3 
Net income98.8 — 98.8 
Foreign currency translation— (8.8)(8.8)
Net transfers to Parent(133.8)— (133.8)
Balance, December 31, 2021$829.8 $(279.3)$550.5 
Net income79.6 — 79.6 
Foreign currency translation— (7.1)(7.1)
Net transfers to Parent(1,590.5)— (1,590.5)
Balance, March 31, 2022$(681.1)$(286.4)$(967.5)
 
Net Parent
Investment
Accumulated
Other
Comprehensive
Loss
Total Parent’s
Equity
Balance, October 1, 2020$833.8 $(261.6)$572.2 
Net income105.3 — 105.3 
Foreign currency translation— 0.1 0.1 
Net transfers to Parent(91.8)— (91.8)
Balance, December 31, 2020$847.3 $(261.5)$585.8 
Net income107.9 — 107.9 
Foreign currency translation— (3.8)(3.8)
Net transfers to Parent(109.2)— (109.2)
Balance, March 31, 2021$846.0 $(265.3)$580.7