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Share Capital (Share Capital) (Details) - USD ($)
$ in Millions
 12 Months Ended
Feb. 09, 2017
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of number of shares outstanding [abstract]      
Beginning balance   $ 2,681.2  
Shares issued through:      
Equity financing (in shares) 31,450,000    
Ending balance   $ 2,602.3 $ 2,681.2
Issued capital [member]      
Reconciliation of number of shares outstanding [abstract]      
Number of shares outstanding   389,101,550.00 267,076,495.000
Beginning balance   $ 3,691.7 $ 2,822.2
Shares issued through:      
Acquisitions (shares)     88,398,804
Acquisitions   $ 0.0 $ 615.3
Equity financing (in shares)     31,450,000
Equity financing     $ 241.8
Share-based employment compensation plans (in shares)   1,984,698 542,250.0
Share-based compensation plans   $ 12.9 $ 3.5
Exercise of warrants (in shares)   163,955 332,466.0
Exercise of warrants   $ 0.6 $ 0.5
Flow-through share financing (in shares)     1,301,535
Flow-through share financing     $ 8.4
Number of shares outstanding   391,250,203.000 389,101,550.00
Ending balance   $ 3,705.2 $ 3,691.7