Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

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Basis of Presentation (Details) - USD ($)
$ in Millions
9 Months Ended
Jan. 01, 2018
Sep. 30, 2018
ASU 2016-16    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Tax effect of intra-entity transfer assets recorded to retained earnings $ 3.9  
Minimum    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Service period for separately-priced contracts   12 months
Maximum    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Service period for separately-priced contracts   36 months