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Real Estate (Damages) (Details) - Hurricane Michael
ft² in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Oct. 07, 2018
ft²
property
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Number of properties effected in catastrophic event | property   2
GLA of properties effected | ft²   0.4
Properties effected, accelerated depreciation $ 13.7  
Proceeds from property insurance 3.0  
Receivables    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Property insurance receivable $ 10.7