Quarterly report pursuant to Section 13 or 15(d)

Basis Of Financial Statement Presentation (Narrative II) (Details)

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Basis Of Financial Statement Presentation (Narrative II) (Details) - USD ($)
$ in Millions
6 Months Ended
Jan. 01, 2018
Jun. 30, 2018
Accounting Standards Update 2016-01 [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Quantification of the effect of adopting the new accounting standard or change in accounting principle expected $ 0.3  
Equity securities without readily determinable fair values $ 2.4  
Accounting Standards Update 2016-02 [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Quantification of the effect of adopting the new accounting standard or change in accounting principle expected   $ 148.6
Lease assets and liabilities recognized, term   12 months