Financial Instruments - Fair Value Measurements and Related Valuation Techniques and Fair Value Hierarchy Level (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Foreign exchange contract
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	$ 45.9	$ 14.3
Fair value, measurements, recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	59.2	47.3
Fair value, measurements, recurring | Foreign exchange contract
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	50.3	14.3
Fair value, measurements, recurring | Net investment hedging
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	(4.4)
Fair value, measurements, recurring | Interest rate swap contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)		(14.7)
Fair value, measurements, recurring | Level 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	59.2	47.3
Fair value, measurements, recurring | Level 1 | Foreign exchange contract
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	0.0	0.0
Fair value, measurements, recurring | Level 1 | Net investment hedging
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	0.0
Fair value, measurements, recurring | Level 1 | Interest rate swap contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)		0.0
Fair value, measurements, recurring | Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	0.0	0.0
Fair value, measurements, recurring | Level 2 | Foreign exchange contract
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	50.3	14.3
Fair value, measurements, recurring | Level 2 | Net investment hedging
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	(4.4)
Fair value, measurements, recurring | Level 2 | Interest rate swap contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)		(14.7)
Fair value, measurements, recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	0.0	0.0
Fair value, measurements, recurring | Level 3 | Foreign exchange contract
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	0.0	0.0
Fair value, measurements, recurring | Level 3 | Net investment hedging
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)	$ 0.0
Fair value, measurements, recurring | Level 3 | Interest rate swap contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset (Liability)		$ 0.0