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Schedule II - Schedule of Valuation and Qualifying Accounts (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 08, 2020
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2020
Increase in real estate impairment reserves     $ 19.0 $ 21.0 $ 48.0  
Increase in accounts receivable and other reserves     23.9 22.0    
Increase (decrease) in valuation allowances     0.8      
Valuation allowances recorded as part of the purchase price allocation of the Circle Transaction $ 14.5          
Increase (decrease) in real estate impairment reserves related to disposals     40.5 (7.2)    
Credit loss recovery related to loan paydowns     2.9      
Increase in accounts receivable reserves         9.3  
Increase in credit loss reserves on financing-type receivables     3.3      
Accounting Standards Update 2016-13            
Credit loss reserve expected           $ 8.4
Domestic Valuation Allowances [Member]            
Increase (decrease) in valuation allowances   $ (4.4)        
Valuation Allowance, Deferred Tax Asset [Member]            
Increase (decrease) in valuation allowances     $ 11.9 $ 7.9 $ (7.7)