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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Jun. 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 impact |  |  | $ 120.0
Canada Revenue Agency |  |  |
Income Tax Contingency [Line Items] |  |  |
Reduction of future deferred tax liability | $ 13.0 |  |

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