Income Taxes - Changes in Uncertain Tax Positions (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Unrecognized tax benefits:
Amount beginning of year	$ 30.1	$ 47.9	$ 33.4
Net increase (decrease):
Tax positions taken in prior periods	(0.4)	(19.6)	0.5
Tax positions taken in current period	6.4	3.6	11.3
Lapse due to applicable statute of limitations	(6.0)	(0.7)	3.4
Changes in currency exchange rates	(1.3)	(1.1)	(0.8)
Amount at end of year	$ 28.8	$ 30.1	47.9
Basic Management Inc And Landwell
Net increase (decrease):
Acquisition of BMI and LandWell			$ 0.1