Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivatives Fair Value [Line Items]
Derivatives assets	$ 31.9	$ 12.6
Derivatives liabilities	480.1	444.9
Net Investment Hedging [Member] | Long Term Debt [Member]
Derivatives Fair Value [Line Items]
Derivatives liabilities	449.5	434.5
Derivatives Designated as Accounting Hedges [Member] | Interest Rate Swap [Member] | Other Assets [Member]
Derivatives Fair Value [Line Items]
Derivatives assets	28.0	12.1
Derivatives Designated as Accounting Hedges [Member] | Interest Rate Swap [Member] | Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivatives liabilities		0.3
Derivatives Designated as Accounting Hedges [Member] | Cross-Currency Swap [Member] | Other Assets [Member]
Derivatives Fair Value [Line Items]
Derivatives assets	0.1
Derivatives Designated as Accounting Hedges [Member] | Net Investment Hedging [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivatives assets	2.5	0.4
Derivatives Designated as Accounting Hedges [Member] | Net Investment Hedging [Member] | Foreign Exchange Contract [Member] | Accounts Payable And Accrued Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivatives liabilities	30.0	1.2
Derivatives Not Designated as Accounting Hedges [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivatives assets	1.3	0.1
Derivatives Not Designated as Accounting Hedges [Member] | Foreign Exchange Contract [Member] | Accounts Payable And Accrued Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivatives liabilities	$ 0.6	1.9
Derivatives Not Designated as Accounting Hedges [Member] | Cross-Currency Swap [Member] | Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivatives liabilities		$ 7.0