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Share Capital - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
9 Months Ended
Aug. 27, 2019
Jul. 02, 2019
Sep. 30, 2019
Class of Stock [Line Items]      
Preferred stock par value (in usd per share)     $ 0.2
Liquidation preference per share (in usd per share)     $ 1,000
Preferred shares lock-up period     5 years
OppenheimerFunds      
Class of Stock [Line Items]      
Preferred stock par value (in usd per share)     $ 0.20
Liquidation preference per share (in usd per share)     $ 1,000
Preferred shares dividend rate (percent)     5.90%
Common Shares | Forward contract      
Class of Stock [Line Items]      
Number of shares to be purchased under forward contract (shares) 6.0 10.0  
Forward contract strike price (in usd per share) $ 16.59 $ 20.00  
Value of treasury shares recorded $ 102.6 $ 193.7  
Derivative notional amount     $ 495.8
Collateral related to the forward contract     $ 63.8