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Income Taxes - Schedule of Effective Income Tax Reconciliation (Footnote) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Increase decrease in income tax expense as result of effectively connected income	$ 28.5	$ 7.4

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- Definition

Increase decrease in income tax expense as result of effectively connected income.

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No definition available.

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