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Fair Value Measurements - Assets Measured on a Nonrecurring Basis (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale $ 796.4 $ 587.3
Homebuilding [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale 0.0 0.0
Financial Services [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale 796.4 587.3
Nonrecurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale 2.9 0.6
Other mortgage loans 1.0 1.4
Inventories [Member] | Nonrecurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventories 4.4 33.4
Fair Value Adjusted - Available for Sale [Member] [Member] | Nonrecurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventories $ 1.4 $ 1.2
Minimum [Member] | Inventories [Member] | Homebuilding [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs, Discount Rate 12.00%  
Maximum [Member] | Inventories [Member] | Homebuilding [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs, Discount Rate 18.00%