The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies.

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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Financial instruments and fair value disclosures - Summary of foreign exchange forward contracts outstanding (Details) € in Millions, ¥ in Millions, £ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 JPY (¥) ¥ / $ € / $ £ / $ € / $ $ / $	Dec. 31, 2016 JPY (¥) $ / $	Dec. 31, 2017 GBP (£)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 GBP (£)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 USD ($)
Disclosure of detailed information about financial instruments [line items]
Financial liabilities carrying amount					$ (3,327.4)			$ (958.7)
Canadian dollar foreign exchange forward purchase contract
Disclosure of detailed information about financial instruments [line items]
Notional amount					190.8			193.0
Canadian dollar foreign exchange forward sales contract
Disclosure of detailed information about financial instruments [line items]
Notional amount					354.4			301.2
United States foreign exchange forward purchase contract
Disclosure of detailed information about financial instruments [line items]
Notional amount					57.9			30.7
United States foreign exchange forward sales contract
Disclosure of detailed information about financial instruments [line items]
Notional amount					77.0			170.4
U.S. dollar \| Canadian dollar foreign exchange forward purchase contract
Disclosure of detailed information about financial instruments [line items]
Notional amount					165.3			175.2
Average exchange rate \| $ / $	1.2742	1.3100
Financial liabilities carrying amount					(2.7)
Financial assets carrying amount								3.8
U.S. dollar \| Canadian dollar foreign exchange forward sales contract
Disclosure of detailed information about financial instruments [line items]
Notional amount					311.5			282.4
Average exchange rate \| $ / $	1.2790	1.2962
Financial liabilities carrying amount								(8.5)
Financial assets carrying amount					6.5
Euro \| Canadian dollar foreign exchange forward purchase contract
Disclosure of detailed information about financial instruments [line items]
Notional amount \| €				€ 15.7			€ 14.8
Average exchange rate	1.4998	1.4163
Financial assets carrying amount					0.2			0.1
Euro \| Canadian dollar foreign exchange forward sales contract
Disclosure of detailed information about financial instruments [line items]
Notional amount \| €				26.1			23.2
Average exchange rate	1.4926	1.4414
Financial liabilities carrying amount					(0.6)
Financial assets carrying amount								0.1
Euro \| United States foreign exchange forward purchase contract
Disclosure of detailed information about financial instruments [line items]
Notional amount \| €				31.9			11.7
Average exchange rate	1.1530	1.0767
Financial liabilities carrying amount								(0.2)
Financial assets carrying amount					2.1
Euro \| United States foreign exchange forward sales contract
Disclosure of detailed information about financial instruments [line items]
Notional amount \| €				€ 57.6			€ 126.9
Average exchange rate	1.1584	1.1270
Financial liabilities carrying amount					(3.3)
Financial assets carrying amount								6.9
British pound \| Canadian dollar foreign exchange forward purchase contract
Disclosure of detailed information about financial instruments [line items]
Notional amount \| £			£ 2.4			£ 3.1
Average exchange rate	1.6919	1.8305
Financial liabilities carrying amount								(0.4)
British pound \| Canadian dollar foreign exchange forward sales contract
Disclosure of detailed information about financial instruments [line items]
Notional amount \| £			£ 1.9			£ 2.4
Average exchange rate	1.7206	1.7976
Financial assets carrying amount								0.2
Japanese yen \| United States foreign exchange forward purchase contract
Disclosure of detailed information about financial instruments [line items]
Notional amount \| ¥	¥ 2,231.2	¥ 1,726.3
Average exchange rate	0.0092	0.0096
Financial liabilities carrying amount					(0.5)			(1.4)
Japanese yen \| United States foreign exchange forward sales contract
Disclosure of detailed information about financial instruments [line items]
Notional amount \| ¥	¥ 1,115.5	¥ 3,276.7
Average exchange rate	0.0092	0.0084
Financial liabilities carrying amount								$ (0.9)
Financial assets carrying amount					$ 0.2