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Cash and Investments - Schedule of Fair Value Measurement (Details) - USD ($)
$ in Millions
 12 Months Ended
May 17, 2019
May 16, 2019
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     $ 74,054.0 $ 70,508.5
Derivative obligations (note 7)     (56,526.7) (52,601.3)
Restricted cash and cash equivalents     789.6 691.5
Investments in associates (fair value $4,154.3; December 31, 2019 – $4,521.7)     6,439.6 5,984.4
Non-insurance companies        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Fair value of investments in associates     1,527.1  
Significant unobservable inputs (Level 3)        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     5,176.8  
Significant unobservable inputs (Level 3) | Private Placement Debt Securities [Member] | Market approach        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     775.4 232.0
Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     $ 36,731.8 $ 33,020.2
Percentage of assets classified as level 1, 2, and 3     100.00% 100.00%
Fair value of investments in associates     $ 7,151.3 $ 7,200.9
Recurring fair value measurement | Short sale and derivative obligations        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Derivative obligations (note 7)     189.4 205.9
Recurring fair value measurement | Cash and cash equivalents        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     5,256.7 4,329.3
Recurring fair value measurement | Short term investments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     8,663.9 6,374.3
Recurring fair value measurement | Short term investments, Canadian government        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     638.1 373.9
Recurring fair value measurement | Short term investments, Canadian provincials        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     1,002.9 755.3
Recurring fair value measurement | Short term investments, U.S. treasury        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     6,343.3 3,154.4
Recurring fair value measurement | Short term investments, Other government        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     501.6 375.8
Recurring fair value measurement | Short term investments, Corporate and other        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     178.0 1,714.9
Recurring fair value measurement | Bonds        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     16,295.3 16,315.4
Recurring fair value measurement | Bonds, Canadian government        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     16.5 664.4
Recurring fair value measurement | Bonds, Canadian provincials        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     49.9 2.9
Recurring fair value measurement | Bonds, U.S. treasury        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     3,058.4 5,610.8
Recurring fair value measurement | Bonds, U.S. states and municipalities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     378.2 216.5
Recurring fair value measurement | Bonds, Other government        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     944.0 1,656.0
Recurring fair value measurement | Bonds, Corporate and other        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     11,848.3 8,164.8
Recurring fair value measurement | Preferred stocks        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     609.9 582.9
Recurring fair value measurement | Preferred stocks, Canadian        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     105.2 90.9
Recurring fair value measurement | Preferred stocks, U.S.        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     17.0 5.0
Recurring fair value measurement | Preferred stocks, Other        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     487.7 487.0
Recurring fair value measurement | Common stocks        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     5,135.1 4,779.8
Recurring fair value measurement | Common stocks, Canadian        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     1,092.7 796.4
Recurring fair value measurement | Common stocks, U.S.        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     1,515.9 1,423.1
Recurring fair value measurement | Common stocks, Other        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     2,526.5 2,560.3
Recurring fair value measurement | Derivatives and other invested assets        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     960.3 844.4
Recurring fair value measurement | Quoted prices (Level 1)        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     $ 16,056.4 $ 10,902.4
Percentage of assets classified as level 1, 2, and 3     43.70% 33.00%
Fair value of investments in associates     $ 3,073.8 $ 3,147.3
Recurring fair value measurement | Quoted prices (Level 1) | Short sale and derivative obligations        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Derivative obligations (note 7)     0.0 0.0
Recurring fair value measurement | Quoted prices (Level 1) | Cash and cash equivalents        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     5,256.7 4,329.3
Recurring fair value measurement | Quoted prices (Level 1) | Short term investments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     8,251.0 4,504.2
Recurring fair value measurement | Quoted prices (Level 1) | Short term investments, Canadian government        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     638.1 373.9
Recurring fair value measurement | Quoted prices (Level 1) | Short term investments, Canadian provincials        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     1,002.9 755.3
Recurring fair value measurement | Quoted prices (Level 1) | Short term investments, U.S. treasury        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     6,343.3 3,154.4
Recurring fair value measurement | Quoted prices (Level 1) | Short term investments, Other government        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     266.7 220.6
Recurring fair value measurement | Quoted prices (Level 1) | Short term investments, Corporate and other        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Quoted prices (Level 1) | Bonds        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Quoted prices (Level 1) | Bonds, Canadian government        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Quoted prices (Level 1) | Bonds, Canadian provincials        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Quoted prices (Level 1) | Bonds, U.S. treasury        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Quoted prices (Level 1) | Bonds, U.S. states and municipalities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Quoted prices (Level 1) | Bonds, Other government        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Quoted prices (Level 1) | Bonds, Corporate and other        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Quoted prices (Level 1) | Preferred stocks        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     10.3 5.3
Recurring fair value measurement | Quoted prices (Level 1) | Preferred stocks, Canadian        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Quoted prices (Level 1) | Preferred stocks, U.S.        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Quoted prices (Level 1) | Preferred stocks, Other        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     10.3 5.3
Recurring fair value measurement | Quoted prices (Level 1) | Common stocks        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     2,538.4 2,063.6
Recurring fair value measurement | Quoted prices (Level 1) | Common stocks, Canadian        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     802.5 577.9
Recurring fair value measurement | Quoted prices (Level 1) | Common stocks, U.S.        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     485.1 360.6
Recurring fair value measurement | Quoted prices (Level 1) | Common stocks, Other        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     1,250.8 1,125.1
Recurring fair value measurement | Quoted prices (Level 1) | Derivatives and other invested assets        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant other observable inputs (Level 2)        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     $ 15,498.6 $ 17,182.7
Percentage of assets classified as level 1, 2, and 3     42.20% 52.00%
Fair value of investments in associates     $ 17.7 $ 19.4
Recurring fair value measurement | Significant other observable inputs (Level 2) | Short sale and derivative obligations        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Derivative obligations (note 7)     (164.1) (205.9)
Recurring fair value measurement | Significant other observable inputs (Level 2) | Cash and cash equivalents        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant other observable inputs (Level 2) | Short term investments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     412.9 1,870.1
Recurring fair value measurement | Significant other observable inputs (Level 2) | Short term investments, Canadian government        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant other observable inputs (Level 2) | Short term investments, Canadian provincials        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant other observable inputs (Level 2) | Short term investments, U.S. treasury        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant other observable inputs (Level 2) | Short term investments, Other government        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     234.9 155.2
Recurring fair value measurement | Significant other observable inputs (Level 2) | Short term investments, Corporate and other        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     178.0 1,714.9
Recurring fair value measurement | Significant other observable inputs (Level 2) | Bonds        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     14,521.1 14,895.3
Recurring fair value measurement | Significant other observable inputs (Level 2) | Bonds, Canadian government        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     16.5 664.4
Recurring fair value measurement | Significant other observable inputs (Level 2) | Bonds, Canadian provincials        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     49.9 2.9
Recurring fair value measurement | Significant other observable inputs (Level 2) | Bonds, U.S. treasury        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     3,058.4 5,610.8
Recurring fair value measurement | Significant other observable inputs (Level 2) | Bonds, U.S. states and municipalities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     378.2 216.5
Recurring fair value measurement | Significant other observable inputs (Level 2) | Bonds, Other government        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     944.0 1,656.0
Recurring fair value measurement | Significant other observable inputs (Level 2) | Bonds, Corporate and other        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     10,074.1 6,744.7
Recurring fair value measurement | Significant other observable inputs (Level 2) | Preferred stocks        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     12.2 8.4
Recurring fair value measurement | Significant other observable inputs (Level 2) | Preferred stocks, Canadian        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     12.2 8.4
Recurring fair value measurement | Significant other observable inputs (Level 2) | Preferred stocks, U.S.        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant other observable inputs (Level 2) | Preferred stocks, Other        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant other observable inputs (Level 2) | Common stocks        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     479.1 534.7
Recurring fair value measurement | Significant other observable inputs (Level 2) | Common stocks, Canadian        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     108.7 103.7
Recurring fair value measurement | Significant other observable inputs (Level 2) | Common stocks, U.S.        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     32.0 33.2
Recurring fair value measurement | Significant other observable inputs (Level 2) | Common stocks, Other        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     338.4 397.8
Recurring fair value measurement | Significant other observable inputs (Level 2) | Derivatives and other invested assets        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     237.4 80.1
Recurring fair value measurement | Significant unobservable inputs (Level 3)        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     $ 5,176.8 $ 4,935.1
Percentage of assets classified as level 1, 2, and 3     14.10% 15.00%
Fair value of investments in associates     $ 4,059.8 $ 4,034.2
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Short sale and derivative obligations        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Derivative obligations (note 7)     (25.3) 0.0
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Cash and cash equivalents        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Short term investments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Short term investments, Canadian government        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Short term investments, Canadian provincials        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Short term investments, U.S. treasury        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Short term investments, Other government        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Short term investments, Corporate and other        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Bonds        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     1,774.2 1,420.1
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Bonds, Canadian government        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Bonds, Canadian provincials        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Bonds, U.S. treasury        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Bonds, U.S. states and municipalities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Bonds, Other government        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     0.0 0.0
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Bonds, Corporate and other        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     1,774.2 1,420.1
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Preferred stocks        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     587.4 569.2
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Preferred stocks, Canadian        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     93.0 82.5
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Preferred stocks, U.S.        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     17.0 5.0
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Preferred stocks, Other        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     477.4 481.7
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Common stocks        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     2,117.6 2,181.5
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Common stocks, Canadian        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     181.5 114.8
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Common stocks, U.S.        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     998.8 1,029.3
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Common stocks, Other        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     937.3 1,037.4
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Derivatives and other invested assets        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Assets     722.9 764.3
Eurobank Ergasias S.A        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Ownership percentage 32.40% 18.00%    
Eurobank Ergasias S.A | Non-insurance companies        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Fair value of investments in associates     $ 799.9 $ 1,164.4
Ownership percentage     30.50% 30.50%
Investments in associates (fair value $4,154.3; December 31, 2019 – $4,521.7)     $ 1,166.3 $ 1,164.4