Income Taxes - Income (Loss) Before Income Taxes and Noncontrolling Interest (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Federal	[1]	$ (23.7)	$ 13.3	$ 328.7
International		97.8	771.0	365.8
Income from continuing operations before income taxes and noncontrolling interest		$ 74.1	$ 784.3	$ 694.5

[1] As a result of the Redomicile, "Federal" reflects income from continuing operations before income taxes and noncontrolling interest for the U.K. in 2015 and 2014 and for Switzerland in 2013.