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Long-term Debt (Tables)
3 Months Ended
Mar. 31, 2016
Debt Disclosure [Abstract]  
Summary of Long-term Debt
The following table provides a summary of the Company's Notes and the fair values based on quoted market prices in less active markets as of March 31, 2016 and December 31, 2015:
 
 
 
 
 
 
 
 
 
Level 2 Fair Value as of
 
Principal Amount at Par
 
Issuance Date
 
Maturity
 
Interest Due Dates
 
March 31, 2016
 
December 31, 2015
 
(in millions)
 
 
 
 
 
 
 
(in millions)
5.50% Senior Notes
$
700.0

 
February 2015
 
2022
 
April 15 and October 15
 
$
732.9

 
$
717.5

5.875% Senior Notes
800.0

 
February 2015
 
2025
 
April 15 and October 15
 
842.0

 
820.0

5.750% Senior Notes
400.0

 
February 2014
 
2024
 
March 1 and September 1
 
422.0

 
411.0

5.375% Senior Notes
500.0

 
February 2013
 
2021
 
February 1 and August 1
 
521.9

 
525.0