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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |
Percentage of income distributed (at least) | 100.00% |
Net deferred tax liability | $ 172.3 | $ 167.0

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