Consolidated Statements of Cash Flows (Parenthetical) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) parcel	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Statement of Cash Flows [Abstract]
Interest paid attributable to noncontrolling interest	$ 1.1	$ 1.1
Interest, capitalized	0.9	$ 1.0
Restricted cash	25.8		$ 36.2
Real estate divested from deconsolidation	(117.0)
Debt divested from deconsolidation	120.7
Noncash increase in unconsolidated investments from deconsolidation	$ 7.8
Number of parcels of land received in transaction | parcel	3
Land received in sale of equity method investment	$ 16.5
Operating lease, right-of-use asset	12.5		$ 13.6
Operating lease liability	$ 12.5