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Revenues - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]        
Rental income $ 296.1 $ 271.2 $ 538.1 $ 503.1