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Investments (Tables)
 9 Months Ended
Sep. 30, 2017
Investments [Abstract]  
Unrealized gain (loss) on investments
Unrealized investment gains/(losses) on available for sale securities were as follows (in millions):
 
September 30,
2017
 
December 31, 2016
Equity securities, at cost less impairments
$
15.5

 
$
16.5

Gross unrealized gains
—

 
21.7

Gross unrealized losses
(9.4
)
 
—

Estimated fair value of equity securities
$
6.1

 
$
38.2