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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2014
Fair Value Disclosures [Abstract]  
Schedule of Fair Values of Selected Financial Instruments Measured On A Non-Recurring Basis
Carrying amounts and estimated fair values of selected financial instruments measured on a non-recurring basis as of the dates indicated were as follows (in millions):
 
September 30, 2014
 
December 31, 2013
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
4.875% Senior Notes
$
400.0

 
$
377.0

 
$
400.0

 
$
380.0

2009 Convertible Notes
$
3.0

 
$
5.9

 
$
12.6

 
$
26.6

2011 Convertible Notes
$
97.0

 
$
192.1

 
$
198.3

 
$
428.3