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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jan. 01, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Retained earnings (deficit)		$ 72.6		$ 72.6		$ (17.9)
Land sales revenue		510.2	$ 481.8	976.2	$ 887.1
Real Estate Management And Development
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Land sales revenue		6.0	10.3	13.2	15.9
Accounting Standards Update 2014-09 \| Real Estate Management And Development
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Receivable	$ 6.1
Contract asset	8.8
Offsetting liability for deferred revenue	8.8
Accounting Standards Update 2014-09 \| Real Estate Management And Development \| Difference between Revenue Guidance in Effect before and after Topic 606
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Retained earnings (deficit)	6.1
Accounting Standards Update 2014-09 \| Real Estate Management And Development \| Difference between Revenue Guidance in Effect before and after Topic 606 \| Non-controlling interest
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Retained earnings (deficit)	$ 2.7
Accounting Standards Update 2014-09 \| Land [Member] \| Real Estate Management And Development \| Difference between Revenue Guidance in Effect before and after Topic 606
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Land sales revenue		$ 0.1		$ (0.2)
ASU 2017-07 \| Cost of Sales
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Reclassification adjustment to other components of net periodic pension and OPEB cost			2.6		5.2
ASU 2017-07 \| Selling, General and Administrative Expenses
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Reclassification adjustment to other components of net periodic pension and OPEB cost			$ 1.7		$ 3.2