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Basis of Presentation (Details)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2018
USD ($)
Lot
Home
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Oct. 01, 2018
USD ($)
Sep. 30, 2018
USD ($)
Entity Information [Line Items]          
Noncontrolling Interest, Ownership Percentage by Parent   75.00%      
Payments to Acquire Businesses   $ 310.9 $ 158.1    
Cumulative Effect on Retained Earnings, Net of Tax $ 27.1        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   25.00%      
Goodwill   $ 163.5     $ 109.2
Contract Asset Insurance Renewals   36.3     0.0
Accounting Standards Update 2016-18 [Member]          
Entity Information [Line Items]          
Increase (Decrease) in Restricted Cash     $ (42.2)    
Accounting Standards Update 2014-09 [Member]          
Entity Information [Line Items]          
Contract Asset Insurance Renewals       $ 32.4  
Series of Individually Immaterial Business Acquisitions [Member]          
Entity Information [Line Items]          
Payments to Acquire Businesses 325.9        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory 265.5        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets 23.3        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other (25.8)        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest 325.9        
Goodwill 54.3        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 8.6        
Business Acquisition, Number of Homes Acquired | Home 700        
Business Acquisition, Number of Finished Lots Acquired | Lot 4,500        
Business Acquisition, Number of Lots Under Option Contracts | Lot 4,300        
Business Acquisition, Sales Order Backlog Acquired (Homes) | Home 700        
Home Building [Member]          
Entity Information [Line Items]          
Goodwill   $ 134.3     $ 80.0
Home Building [Member] | Midwest [Member]          
Entity Information [Line Items]          
Goodwill $ 49.7        
Home Building [Member] | East [Member]          
Entity Information [Line Items]          
Goodwill 4.6        
Minimum [Member] | Series of Individually Immaterial Business Acquisitions [Member]          
Entity Information [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   1 year      
Maximum [Member] | Series of Individually Immaterial Business Acquisitions [Member]          
Entity Information [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   3 years      
Retained Earnings [Member]          
Entity Information [Line Items]          
Cumulative Effect on Retained Earnings, Net of Tax 27.1        
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member]          
Entity Information [Line Items]          
Cumulative Effect on Retained Earnings, Net of Tax $ 27.1