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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Income Tax Contingency [Line Items]      
Statutory tax rate 21.00% 21.00%  
2017 Tax Act decrease of deferred tax expense     $ (156.0)
2017 Tax Act, increase in taxes payable     36.0
2017 Tax Act, net tax benefit     $ 120.0
Canada Revenue Agency      
Income Tax Contingency [Line Items]      
Reduction of future deferred tax liability $ 15.0 $ 13.0