Debt and Credit Arrangements (Tables)

12 Months Ended

Dec. 31, 2011

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,
			2011				2010
			Book Value		Fair Value 1		Book Value		Fair Value 1
7.25% Senior Unsecured Notes due 2011	7.25	%	$	0.0	$	0.0	$	36.3	$	37.0
6.25% Unsecured Notes due 2014 (less unamortized discount of $0.3)	6.29	%	354.3		374.5		353.3		378.0
10.0% Senior Unsecured Notes due 2017 (less unamortized discount of $9.4)	10.38	%	590.6		690.0		589.4		705.0
4.75% Convertible Senior Notes due 2023 (plus unamortized premium of $2.7)	3.50	%	202.7		220.5		205.0		235.0
4.25% Convertible Senior Notes due 2023 (plus unamortized premium of $3.0)	0.58	%	403.0		405.5		417.4		444.4
Other notes payable and capitalized leases			65.1				20.8
Total long-term debt			1,615.7				1,622.2
Less: current portion 2			404.8				38.9
Long-term debt, excluding current portion			$	1,210.9			$	1,583.3

¹  Fair values are derived from trading quotes by institutions making a market in the securities and estimations of value by those institutions using proprietary models.

²  On March 15, 2012, holders of our 4.25% Convertible Senior Notes due 2023 (the “4.25% Notes”) may require us to repurchase their notes for cash at par, and accordingly, we included these notes in the current portion of long-term debt on our December 31, 2011 Consolidated Balance Sheet. The 4.25% Notes are redeemable in whole or in part at our option beginning March 15, 2012. Any 4.25% Notes not repurchased on March 15, 2012 and not called for redemption by us will be reclassified to long-term debt. On August 15, 2011, our 7.25% Senior Unsecured Notes due 2011 (the "2011 Notes") matured. Therefore we included these notes in current portion of long-term debt on our December 31, 2010 Consolidated Balance Sheet.

Annual Maturities of Long-term Debt

Annual maturities are scheduled as follows based on the book value as of December 31, 2011.

2012 1	$	1.8
2013 2	16.0
2014	354.4
2015	0.1
2016	0.1
Thereafter	1,243.3
Total long-term debt	$	1,615.7

¹  Holders of our 4.25% Notes may require us to repurchase their notes for cash at par in March 2012. The 4.25% Notes are redeemable in whole or in part at our option beginning March 15, 2012.

²  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 in March 2013.

Conversion Rates and Conversion Prices for Convertible Notes

The conversion rates and corresponding conversion prices for our Convertible Notes as of December 31, 2011, 2010 and 2009 are listed below.

	December 31,
	2011		2010		2009
Conversion price	$	12.13	$	12.42	$	12.42
Conversion rate per note (actual number)	82.4612		80.5153		80.5153

Repurchase and Redemption Options for Convertible Notes

The following table details when the repurchase and redemption options occur for our 4.25% and 4.75% Notes.

	4.25% Notes		4.75% Notes
Repurchase options
For cash on		3/15/2012
For cash, common stock or combination on	1)	3/15/2015	1)	3/15/2013
	2)	3/15/2018	2)	3/15/2018
Change of control events occurring prior to		3/15/2012		3/15/2013
Redemption options
For cash on or after		3/15/2012		3/15/2013

Strike Price and Cap Price for Capped Call Transaction

The strike price and cap price related to the capped call options as of December 31, 2011 and 2010 are listed below.

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

Summary of Credit Facilities

A summary of our credit facilities is presented below.

	December 31,
	2011								2010
	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	$	16.2	$	983.8	$	650.0	$	0.0	$	16.2	$	633.8
Uncommitted credit agreements	$	458.3	$	153.5	$	2.6	$	302.2	$	455.2	$	114.8	$	0.1	$	340.3

Summary of Financial Covenants in Credit Agreement

The financial covenants in the Credit Agreement require that we maintain, as of the end of each fiscal quarter, certain financial measures for the four quarters then ended. The table below sets forth the financial covenants in effect as of December 31, 2011 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.