Revenues -Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Remaining performance obligation	$ 86.9
Remaining performance obligation, expected timing of satisfaction	5 years
Rental income	$ 1,149.8	$ 1,076.9	$ 1,001.8