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Investments (Tables)
 6 Months Ended
Jul. 02, 2016
Investments [Abstract]  
Schedule of Gains (Losses) on Available for Sale Securities
Unrealized investment gains (losses) on available for sale securities were as follows (in millions):
 
July 2,
2016
 
December 31, 2015
Equity securities, at cost less impairments
$
20.2

 
$
6.4

Gross unrealized gains
19.8

 
9.3

Gross unrealized losses
—

 
(0.8
)
Estimated fair value of equity securities
$
40.0

 
$
14.9