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Current Relevant Accounting Standards (Narrative) (Details) - Accounting Standards Update 2016-01 [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact on net income	$ 0.8
Impact on retained earnings		$ 5.5

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

+ References + Details