Notes And Other Receivables Notes and Other Receivables, Other receivables - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables for rent, water, sewer usage	$ 13.0	$ 7.1
Allowance for rent, water, sewer usage receivables		(1.5)
Contract with Customer, Asset, Reclassified to Receivable	18.0	16.1
Insurance receivables	18.5	$ 24.1
Other Receivables	$ 21.1