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Investments (Tables)
 3 Months Ended
Apr. 02, 2016
Investments [Abstract]  
Schedule of Unrealized Investment Gains (Losses)
Unrealized investment gains (losses) on available for sale securities were as follows (in millions):
 
April 2,
2016
 
December 31, 2015
Equity securities, at cost less impairments
$
21.9

 
$
6.4

Gross unrealized gains
19.2

 
9.3

Gross unrealized losses
(2.5
)
 
(0.8
)
Estimated fair value of equity securities
$
38.6

 
$
14.9