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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Retained earnings (deficit)		$ 220.3				$ (17.9)				$ 220.3	$ (17.9)
Land sales revenue		$ 388.7	$ 455.2	$ 510.2	$ 466.0	$ 495.9	$ 496.5	$ 481.7	$ 405.3	1,820.1	1,879.4	$ 1,519.4
Real Estate Management And Development
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Land sales revenue										40.0	38.4	46.2
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 \| Difference between Revenue Guidance in Effect before and after Topic 606 \| Real Estate Management And Development
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Retained earnings (deficit)	6.1
Accounting Standards Update 2014-09 \| Difference between Revenue Guidance in Effect before and after Topic 606 \| Real Estate Management And Development \| Non-controlling interest
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Retained earnings (deficit)	$ 2.7
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											10.8	7.7
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											$ 6.8	$ 3.8
Land [Member] \| Accounting Standards Update 2014-09 \| Difference between Revenue Guidance in Effect before and after Topic 606 \| Real Estate Management And Development
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Land sales revenue										$ 0.1