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Convertible Securities (Tables)
 12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]  
Schedule of Carrying Value of Convertible Securities
The carrying values of the Company's convertible securities are as follows:
 
December 31, 2013
 
December 31, 2014
 
Carrying
Value
 
Principal amount
at maturity
 
Carrying
Value
 
Principal amount
at maturity
Junior convertible securities:
 
 
 
 
 
 
 
2007 junior convertible securities(1)
$
301.2

 
$
430.8

 
$
303.1

 
$
430.8

2006 junior convertible securities
217.5

 
300.0

 
—

 
—

Total junior convertible securities
$
518.7

 
$
730.8

 
$
303.1

 
$
430.8

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(1)
The carrying value is accreted to the principal amount at maturity over a remaining life of 23 years.