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Investments (Tables)
 12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities, Equity Method Investments and Joint Ventures [Abstract]  
Schedule of unrealized gains (losses) on available for sale securities
Unrealized investment gains (losses) on available for sale securities were as follows (in millions):
 
Year Ended
 
Six Months Ended
 
Year Ended
 
December 31,
2016
 
December 31,
2015
 
June 27,
2015
Net unrealized investment gains (losses):
 
 
 
 
 
Equity securities, at cost less impairments
$
16.5

 
$
6.4

 
$
17.1

Gross unrealized gains
21.7

 
9.3

 
5.7

Gross unrealized losses
—

 
(0.8
)
 
(10.1
)
Estimated fair value of equity securities
$
38.2

 
$
14.9

 
$
12.7