Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Derivatives Fair Value [Line Items]
Derivatives assets	$ 7.6	$ 12.6
Derivatives liabilities	427.3	444.9
Derivatives Designated as Accounting Hedges [Member]
Derivatives Fair Value [Line Items]
Derivatives assets	7.6	12.5
Derivatives liabilities	0.8	1.5
Derivatives Designated as Accounting Hedges [Member] | Interest Rate Swap [Member] | Other Assets [Member]
Derivatives Fair Value [Line Items]
Derivatives assets	7.0	12.1
Derivatives Designated as Accounting Hedges [Member] | Interest Rate Swap [Member] | Other Noncurrent Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivatives liabilities	0.8	0.3
Derivatives Not Designated as Accounting Hedges [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivatives assets		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	0.8	1.9
Derivatives Not Designated as Accounting Hedges [Member] | Cross-Currency Swap [Member] | Other Noncurrent Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivatives liabilities	3.8	7.0
Net Investment Hedging [Member] | Long-Term Debt [Member]
Derivatives Fair Value [Line Items]
Derivatives liabilities	421.9	434.5
Net Investment Hedging [Member] | Derivatives Designated as Accounting Hedges [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivatives assets	$ 0.6	0.4
Net Investment Hedging [Member] | Derivatives Designated as Accounting Hedges [Member] | Foreign Exchange Contract [Member] | Accounts Payable and Accrued Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivatives liabilities		$ 1.2