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Leases - The Company as Lessor - Schedule of Rental Income Under Non-cancelable Operating Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Lease payments $ 113.7 $ 111.2
Variable lease payments 39.3 51.8
Total rental income $ 153.0 $ 163.0