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Leases ASC 842 (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Lessor Disclosure [Abstract]    
Rental and other revenues related to operating lease payments $ 179.9 $ 189.6
Variable lease income $ 14.5 $ 16.5
Minimum [Member]    
Lessor Disclosure [Abstract]    
Operating leases, term of leases (in years) 3 years  
Maximum [Member]    
Lessor Disclosure [Abstract]    
Operating leases, term of leases (in years) 10 years