Financial Investments - Summary of Financial Investments (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of financial assets [line items]
Amortised cost	$ 48.8
Fair value through other comprehensive income	507.7
Fair value through profit or loss	1,370.4
Total	1,926.9
Amortised cost, current portion	1.1
Amortised cost,non-current	47.7
Fair value through other comprehensive income, current portion	507.7
Fair value through other comprehensive income, non-current	0.0
Fair value through profit or loss, current portion	1,234.6
Fair value through profit or loss, non-current	135.8
Current portion, total	1,743.4
Non-current, total	183.5
Previously stated [member]
Disclosure of financial assets [line items]
Amortised cost		$ 50.5
Fair value through other comprehensive income		1,307.6
Fair value through profit or loss		1,259.2
Total		2,617.3
Amortised cost, current portion		1.3
Amortised cost,non-current		49.2
Fair value through other comprehensive income, current portion		1,307.6
Fair value through other comprehensive income, non-current		0.0
Fair value through profit or loss, current portion		1,057.2
Fair value through profit or loss, non-current		202.0
Current portion, total		2,366.1
Non-current, total		251.2
Private securities [member]
Disclosure of financial assets [line items]
Fair value through other comprehensive income	50.4
Total	50.4
Private securities [member] \| Previously stated [member]
Disclosure of financial assets [line items]
Fair value through other comprehensive income		516.0
Fair value through profit or loss		0.6
Total		516.6
Structured notes [member]
Disclosure of financial assets [line items]
Amortised cost	48.8
Fair value through profit or loss	1,308.0
Total	1,356.8
Structured notes [member] \| Previously stated [member]
Disclosure of financial assets [line items]
Amortised cost		50.5
Fair value through profit or loss		1,199.6
Total		1,250.1
Fixed deposits [member]
Disclosure of financial assets [line items]
Fair value through other comprehensive income	457.3
Fair value through profit or loss	0.1
Total	457.4
Fixed deposits [member] \| Previously stated [member]
Disclosure of financial assets [line items]
Fair value through other comprehensive income		791.6
Total		791.6
Investment funds [member]
Disclosure of financial assets [line items]
Fair value through profit or loss	2.4
Total	2.4
Other Financial Instruments [member]
Disclosure of financial assets [line items]
Fair value through profit or loss	59.9
Total	$ 59.9
Other Financial Instruments [member] \| Previously stated [member]
Disclosure of financial assets [line items]
Fair value through profit or loss		59.0
Total		$ 59.0

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The amount of current financial assets measured at amortised cost. [Refer: Financial assets at amortised cost]

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The amount of current financial assets at fair value through other comprehensive income. [Refer: Financial assets at fair value through other comprehensive income]

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The amount of current financial assets measured at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss]

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The amount of current investments.

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets]

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The amount of financial assets at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets; Other comprehensive income]

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The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets]

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The amount of non-current financial assets measured at amortised cost. [Refer: Financial assets at amortised cost]

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The amount of non-current financial assets at fair value through other comprehensive income. [Refer: Financial assets at fair value through other comprehensive income]

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The amount of non-current financial assets measured at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss]

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