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Common Equity Instruments Held

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Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Percent

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The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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The amount of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: At fair value [member]; Other comprehensive income]

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The gains (losses) recognised in profit or loss for assets measured at fair value that are attributable to the change in unrealised gains or losses relating to those assets held at the end of the reporting period. [Refer: At fair value [member]]

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The amount of a hedged item, recognised as a liability. [Refer: Hedged items [member]]

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The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

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The amount of other comprehensive income, net of tax, related to hedges of net investments in foreign operations. [Refer: Other comprehensive income]

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The entity's share of the profit (loss) of associates accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Profit (loss)]

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Financial Risk Management - Market Price Fluctuations - Narrative (Details) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 CAD ($)	Dec. 31, 2018 EUR (€)	May 18, 2018 EUR (€)	Apr. 17, 2018 USD ($)	Mar. 29, 2018 USD ($)	Mar. 29, 2018 EUR (€)	Dec. 31, 2017 CAD ($)	Dec. 31, 2017 EUR (€)	Dec. 04, 2017 CAD ($)
Disclosure of detailed information about financial instruments [line items]
Share of profit of associates	$ 221.1	$ 200.5
Market value	307.4	204.3
Notional amount	6,506.4	6,396.9
Fair value	6,570.1	6,676.5
CPI-linked derivative contracts
Disclosure of detailed information about financial instruments [line items]
Market value	$ 24.9	$ 39.6
Average life (in years)	3 years 7 months 6 days	4 years 7 months 6 days
Notional amount	$ 114,426.4	$ 117,254.6
Equity price risk
Disclosure of detailed information about financial instruments [line items]
Market value	595.6	833.8
Notional amount	595.6	833.8
Equity price risk \| Investment Portfolio With Ten Largest Issuers
Disclosure of detailed information about financial instruments [line items]
Common equity instrument	$ 2,681.1	$ 3,138.1
Risk exposure percentage	6.90%	8.00%	6.90%	6.90%					8.00%	8.00%
Equity price risk \| Investment Portfolio With Single Largest Issuer
Disclosure of detailed information about financial instruments [line items]
Common equity instrument	$ 497.1	$ 549.0
Risk exposure percentage	1.30%	1.40%	1.30%	1.30%					1.40%	1.40%
Other price risk \| CPI-linked derivative contracts
Disclosure of detailed information about financial instruments [line items]
Average life (in years)	3 years 7 months 6 days	4 years 7 months 6 days
Net change in unrealized gains (losses)	$ (6.7)	$ (71.0)
Currency risk
Disclosure of detailed information about financial instruments [line items]
Change in interest rate on investments	10.00%
Common Stock, Other Funds
Disclosure of detailed information about financial instruments [line items]
Portfolio investments	$ 150.3	90.9
Bottom of range \| Equity price risk
Disclosure of detailed information about financial instruments [line items]
Change in interest rate on investments	5.00%
Top of range \| Equity price risk
Disclosure of detailed information about financial instruments [line items]
Change in interest rate on investments	10.00%
Unsecured senior notes
Disclosure of detailed information about financial instruments [line items]
Notional amount					€ 150,000,000	$ 600.0		€ 600,000,000			$ 650.0
Unsecured senior notes \| Hedges of net investment in foreign operations
Disclosure of detailed information about financial instruments [line items]
Borrowings \| €					150,000,000.0			€ 600,000,000.0
Non-insurance associates
Disclosure of detailed information about financial instruments [line items]
Fair value of investments in associates	$ 4,522.4	3,846.2
Quess \| Investments accounted for using equity method
Disclosure of detailed information about financial instruments [line items]
Fair value of equity method investment	1,109.5
Share of profit of associates	889.9
Canada
Disclosure of detailed information about financial instruments [line items]
Gains (losses) on hedge of net investment in Canadian subsidiaries	166.3	(106.3)
Canada \| Unsecured senior notes \| Hedges of net investment in foreign operations
Disclosure of detailed information about financial instruments [line items]
Borrowings			$ 2,691.5						$ 2,212.9
Borrowings at fair value	2,028.4	1,868.6
Europe
Disclosure of detailed information about financial instruments [line items]
Gains (losses) on hedge of net investment in Canadian subsidiaries	57.1	0.0
Europe \| Unsecured senior notes \| Hedges of net investment in foreign operations
Disclosure of detailed information about financial instruments [line items]
Borrowings \| €				€ 750,000,000						€ 0
Borrowings at fair value	854.5
Holding company
Disclosure of detailed information about financial instruments [line items]
Portfolio investments	1,557.2	2,368.4
Notional amount	3,893.7	3,492.0
Fair value	3,963.6	3,723.5
Holding company \| 2.75% due March 29, 2028
Disclosure of detailed information about financial instruments [line items]
Notional amount	857.4	0.0		€ 750,000,000.0	€ 150,000,000		$ 600.0
Fair value	$ 854.5	$ 0.0