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Income Taxes - Components of Earnings Before Income Taxes and Provision for Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
United States									$ 278.6	$ 351.3	$ 345.6
Foreign, principally Australia, Canada, New Zealand and the U.K.									99.5	5.6	(52.1)
Earnings before income taxes	$ 82.1	$ 96.7	$ 147.0	$ 52.3	$ 68.8	$ 94.9	$ 137.5	$ 55.7	378.1	356.9	293.5
Federal Current									16.4	45.9	43.9
Federal Deferred									(160.4)	(146.7)	(139.4)
Total Provision (benefit) for income taxes, Federal									(144.0)	(100.8)	(95.5)
State and local Current									6.7	8.4	18.9
State and local Deferred									1.4	(0.3)	(3.3)
Total Provision (benefit) for income taxes, State and local									8.1	8.1	15.6
Foreign Current									29.1	22.4	22.9
Foreign Deferred									(14.3)	(17.8)	(38.6)
Total Provision (benefit) for income taxes, Foreign									14.8	4.6	(15.7)
Benefit for income taxes									$ (121.1)	$ (88.1)	$ (95.6)

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