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Basis of Presentation (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Oct. 01, 2019
Entity Information [Line Items]      
Operating Lease, Right-of-Use Asset $ 0.0 $ 36.2 $ 39.0
Noncontrolling Interest, Ownership Percentage by Parent   65.00%  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   35.00%  
Operating Lease, Liability 0.0 $ 37.6 $ 40.3
Assets Leased to Others [Member] | Single Family [Member]      
Entity Information [Line Items]      
Prior Period Reclassification Adjustment $ 37.0