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Subsequent Events - Real Estate Investment Activity (Details)
$ in Millions
2 Months Ended 12 Months Ended
Feb. 17, 2017
USD ($)
property
Dec. 31, 2016
property
Dec. 31, 2015
property
Subsequent Event [Line Items]      
Number of real estate properties disposed | property   101 228
Subsequent Event [Member] | 2017 Acquisitions [Member]      
Subsequent Event [Line Items]      
Number of properties acquired | property 1    
Total purchase price of assets acquired $ 46.0    
Number of properties with consolidated fee and leasehold interest | property 3    
Land purchases $ 20.4    
Subsequent Event [Member] | 2017 Property Dispositions [Member]      
Subsequent Event [Line Items]      
Number of real estate properties disposed | property 19    
Aggregate gross sales price $ 67.2    
Company's share of proceeds 62.3    
Estimated gain on sale of properties $ 5.1