Debt and Credit Arrangements (Tables)

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Summary of Carrying Amounts and Fair Values of Long-term Debt

A summary of the carrying amounts and fair values of our debt is listed below.

	Effective Interest Rate		December 31,
			2013				2012
			Book Value		Fair Value 1		Book Value		Fair Value
6.25% Senior Unsecured Notes due 2014 (less unamortized discount of $0.1)	6.29	%	$	351.3	$	365.6	$	352.8	$	372.6
2.25% Senior Notes due 2017 (less unamortized discount of $0.6)	2.30	%	299.4		293.0		299.3		297.8
4.00% Senior Notes due 2022 (less unamortized discount of $2.6)	4.13	%	247.4		241.6		247.1		258.7
3.75% Senior Notes due 2023 (less unamortized discount of $1.4)	4.32	%	498.6		467.3		498.5		499.7
10.00% Senior Unsecured Notes due 2017			0.0		0.0		591.9		660.8
4.75% Convertible Senior Notes due 2023			0.0		0.0		200.5		202.8
Other notes payable and capitalized leases			86.7		87.8		87.3		90.8
Total long-term debt			1,483.4				2,277.4
Less: current portion 2			353.6				216.6
Long-term debt, excluding current portion			$	1,129.8			$	2,060.8

¹  See Note 12 for information on the fair value measurement of our long-term debt.

²  We included our 6.25% Senior Unsecured Notes due 2014 (the "6.25% Notes") in the current portion of long-debt on our December 31, 2013 Consolidated Balance Sheet because the 6.25% Notes are scheduled to mature on November 15, 2014. We included our 4.75% Convertible Senior Notes due 2023 (the "4.75% Notes") in the current portion of long-term debt on our December 31, 2012 Consolidated Balance Sheet because holders of the 4.75% Notes had an option to require us to repurchase their Notes for cash, stock, or a combination, at our election, at par on March 15, 2013. The 4.75% Notes were retired in the first quarter of 2013.

Annual Maturities of Long-term Debt

Annual maturities are scheduled as follows based on the book value as of December 31, 2013.

2014	$	353.6
2015	2.2
2016	2.3
2017	301.7
2018	24.8
Thereafter	798.8
Total long-term debt	$	1,483.4

Summary of Credit Facilities

A summary of our credit facilities is presented below.

	December 31,
	2013								2012
	Total Facility		Amount Outstanding		Letters of Credit		Total Available		Total Facility		Amount Outstanding		Letters of Credit		Total Available
Committed credit agreement	$	1,000.0	$	0.0	$	14.3	$	985.7	$	1,000.0	$	0.0	$	15.1	$	984.9
Uncommitted credit agreements	$	700.2	$	179.1	$	4.2	$	516.9	$	317.2	$	172.1	$	3.3	$	141.8

Summary of Financial Covenants in Credit Agreement

December 31, 2013 and thereafter.

Interest coverage ratio (not less than): 1	5.00x
Leverage ratio (not greater than): 2	3.25x

¹  The interest coverage ratio is defined as EBITDA, as defined in the Credit Agreement, to net interest expense plus cash dividends on convertible preferred stock for the four quarters then ended.

²  The leverage ratio is defined as debt as of the last day of such fiscal quarter to EBITDA, as defined in the Credit Agreement, for the four quarters then ended.