Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Tax Note Textuals [Line Items]
Unrecognized Tax Benefits Impact on Effective Tax Rate	$ (13.0)
Tax Matters Agreement Receivable, Continuing Operations	1.6
Tax Matters Agreement Receivable, Discontinued Operations	13.2
Additional deferred tax liability	(21.5)
Deferred taxes not provided for excess of financial reporting over tax basis of investments in foreign subsidiaries	809.7
Cash and Cash Equivalents	415.7	$ 584.0	$ 507.3	$ 544.5
Income Tax Holiday, Aggregate Dollar Amount	$ (4.1)
Income Tax Holiday, Income Tax Benefits Per Share	$ (0.05)
Deferred income tax benefit	$ 70.1	71.3	$ (309.6)
Net operating loss carryforwards in Luxembourg	191.9
Excess income tax benefit from stock-based compensation	$ 3.4	10.4
The tax benefits recognized in the Consolidated Financial Statements from such positions are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement	The tax benefits recognized in the Consolidated Financial Statements from such positions are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement.
Estimated change in unrecognized tax benefits	$ 16.0
Interest (income) expense related to tax matters	(5.7)	0.8
Interest accrued from income tax examinations	9.8	$ 19.4
Tax Matters Agreement Receivable, Total	14.8
Continuing Operations [Member]
Tax Note Textuals [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions	18.0
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	38.2
Discontinued Operations [Member]
Tax Note Textuals [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions	20.9
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	3.7
Foreign net operating losses [Member]
Tax Note Textuals [Line Items]
Decrease in valuation allowance	11.4
Non US Subsidiaries [Member]
Tax Note Textuals [Line Items]
Cash and Cash Equivalents	432.7
Tax Benefit from Audit Adjustments [Member] | Continuing Operations [Member]
Tax Note Textuals [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions	8.0
Tax Benefit from Audit Adjustments [Member] | Discontinued Operations [Member]
Tax Note Textuals [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions	17.4
Recognition of Previously Unrecognized Tax Position [Member] | Continuing Operations [Member]
Tax Note Textuals [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions	10.0
Recognition of Previously Unrecognized Tax Position [Member] | Discontinued Operations [Member]
Tax Note Textuals [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions	$ 38.3