Debt and Credit Arrangements (Tables)

12 Months Ended

Dec. 31, 2012

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 long-term debt is listed below.

	Effective Interest Rate		December 31,
			2012				2011
			Book Value		Fair Value 1		Book Value		Fair Value
6.25% Senior Unsecured Notes due 2014 (less unamortized discount of $0.2)	6.29	%	$	352.8	$	372.6	$	354.3	$	374.5
10.00% Senior Unsecured Notes due 2017 (less unamortized discount of $8.1)	10.38	%	591.9		660.8		590.6		690.0
2.25% Senior Notes due 2017 (less unamortized discount of $0.7)	2.30	%	299.3		297.8		0.0		0.0
4.00% Senior Notes due 2022 (less unamortized discount of $2.9)	4.13	%	247.1		258.7		0.0		0.0
3.75% Senior Notes due 2023 (less unamortized discount of $1.5)	4.32	%	498.5		499.7		0.0		0.0
4.75% Convertible Senior Notes due 2023 (plus unamortized premium of $0.5) 2	3.50	%	200.5		202.8		202.7		220.5
4.25% Convertible Senior Notes due 2023			0.0		0.0		403.0		405.5
Other notes payable and capitalized leases			87.3		90.8		65.1
Total long-term debt			2,277.4				1,615.7
Less: current portion 3			216.6				404.8
Long-term debt, excluding current portion			$	2,060.8			$	1,210.9

¹  See Note 11 for information on the fair value measurement of our long-term debt.

²  See Note 17 for further information regarding subsequent events.

³  On March 15, 2013, holders of our 4.75% Convertible Senior Notes due 2023 (the “4.75% Notes”) may require us to repurchase their notes for cash, stock or a combination, at our election, at par, and accordingly, we included these notes in the current portion of long-term debt on our December 31, 2012 Consolidated Balance Sheet. We included our 4.25% Convertible Senior Notes due 2023 (the “4.25% Notes”) in the current portion of long-term debt on our December 31, 2011 Consolidated Balance Sheet because holders of the 4.25% Notes had a repurchase option on March 15, 2012 for cash at par. The 4.25% Notes were retired in the first quarter of 2012.

Annual Maturities of Long-term Debt

Annual maturities are scheduled as follows based on the book value as of December 31, 2012.

2013 1	$	16.1
2014	352.8
2015	0.1
2016	0.1
2017	913.8
Thereafter	994.5
Total long-term debt	$	2,277.4

¹  Holders of our 4.75% Notes may require us to repurchase their notes for cash, stock or a combination, at our election, at par in March 2013.

Conversion Rates and Conversion Prices for 4.75% Notes

The conversion rates, corresponding conversion prices and conversion shares for our 4.75% Notes are listed below.

	December 31,
	2012		2011		2010
Conversion price	$	11.86	$	12.13	$	12.42
Conversion rate per note (actual number)	84.3402		82.4612		80.5153
Conversion shares	16.9		16.5		16.1

Strike Price and Cap Price for Capped Call Transaction

The strike price and cap price related to the capped call options are listed below.

	December 31,
	2012		2011		2010
Strike price	$	11.86	$	12.13	$	12.42
Cap price	$	17.43	$	17.83	$	18.26

Summary of Credit Facilities

A summary of our credit facilities is presented below.

	December 31,
	2012								2011
	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	$	15.1	$	984.9	$	1,000.0	$	0.0	$	16.2	$	983.8
Uncommitted credit agreements	$	317.2	$	172.1	$	3.3	$	141.8	$	458.3	$	153.5	$	2.6	$	302.2

Summary of Financial Covenants in Credit Agreement

The table below sets forth the financial covenants in effect as of December 31, 2012 and thereafter.

Interest coverage ratio (not less than): 1	5.00x
Leverage ratio (not greater than): 2	2.75x

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.