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Fair Value Measurements - Nonrecurring (Details)
$ in Millions
9 Months Ended
Jun. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Document Period End Date Jun. 30, 2019  
Mortgage loans held for sale $ 954.9 $ 796.4
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale 0.0 0.0
Other mortgage loans 0.0 0.0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Inventories [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 0.0 0.0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Assets Held-for-sale [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 0.0 0.0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale 1.0 2.9
Other mortgage loans 1.0 1.0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Inventories [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 14.6 4.4
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Assets Held-for-sale [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 0.0 1.4
Home Building [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale $ 0.0 $ 0.0
Measurement Input, Discount Rate [Member] | Home Building [Member] | Inventories [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventories 0.14  
Measurement Input, Discount Rate [Member] | Home Building [Member] | Inventories [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventories 0.16