14. Debt

The Company’s debt at March 31, 2016 and December 31, 2015 consisted of the following:

	March 31,			December 31,
	2016			2015
Borrowings under the Credit Agreement	$	145.0		$	—
8.60% senior notes due August 15, 2016		219.7			219.6
6.125% senior notes due January 15, 2017		251.3			251.2
7.25% senior notes due May 15, 2018		250.0			250.0
11.25% senior notes due February 1, 2019 _(a)		172.2			172.2
8.25% senior notes due March 15, 2019		238.9			238.9
7.625% senior notes due June 15, 2020		350.0			350.0
7.875% senior notes due March 15, 2021		448.6			448.5
8.875% debentures due April 15, 2021		80.9			80.9
7.00% senior notes due February 15, 2022		400.0			400.0
6.50% senior notes due November 15, 2023		350.0			350.0
6.00% senior notes due April 1, 2024		400.0			400.0
6.625% debentures due April 15, 2029		199.5			199.5
8.820% debentures due April 15, 2031		69.0			69.0
Other _(b)		26.7			18.7
Unamortized debt issuance costs		(24.5	)		(25.6	)
Total debt		3,577.3			3,422.9
Less: current portion		(634.4	)		(234.6	)
Long-term debt	$	2,942.9		$	3,188.3

(a)	As of March 31, 2016 and December 31, 2015, the interest rate on the 11.25% senior notes due February 1, 2019 was 13.0% and 12.75%, respectively, as a result of downgrades in the ratings of the notes by the rating agencies.

(b)	Includes fair value adjustments to the 8.25% senior notes due March 15, 2019 related to the Company’s fair value hedges, miscellaneous debt obligations and capital leases.

The fair values of the senior notes and debentures, which were determined using the market approach based upon interest rates available to the Company for borrowings with similar terms and maturities, were determined to be Level 2 under the fair value hierarchy. The fair value of the Company’s debt was less than its book value by approximately $159.4 million and $39.7 million at March 31, 2016 and December 31, 2015, respectively.

The Company’s $1.5 billion senior secured revolving credit facility (the “Credit Agreement”) is subject to a number of covenants, including a minimum Interest Coverage Ratio and a maximum Leverage Ratio, as defined in and calculated pursuant to the Credit Agreement, that, in part, restrict the Company’s ability to incur additional indebtedness, create liens, engage in mergers and consolidations, make restricted payments and dispose of certain assets. The Credit Agreement generally allows annual dividend payments of up to $225.0 million in aggregate, though additional dividends may be allowed subject to certain conditions.

The weighted average interest rate on borrowings under the Credit Agreement was 2.3% and 2.1% during the three months ended March 31, 2016 and 2015, respectively.

Interest income was $1.3 million and $1.7 million for the three months ended March 31, 2016 and 2015, respectively.