Debt and Other Financing (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended	12 Months Ended																														12 Months Ended
	Mar. 31, 2009	Mar. 31, 2008	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jan. 31, 2013	Mar. 31, 2012	Apr. 30, 2003	Dec. 31, 2012 Term Loan [Member]	Dec. 31, 2011 Term Loan [Member]	Dec. 31, 2012 Four Point Eight Percent Notes, Due March Two Thousand Thirteen [Member]	Dec. 31, 2011 Four Point Eight Percent Notes, Due March Two Thousand Thirteen [Member]	Mar. 31, 2008 Four Point Eight Percent Notes, Due March Two Thousand Thirteen [Member]	Dec. 31, 2012 Four Point Six Two Five Percent Notes, Due May Two Thousand Thirteen [Member]	Dec. 31, 2011 Four Point Six Two Five Percent Notes, Due May Two Thousand Thirteen [Member]	May 31, 2003 Four Point Six Two Five Percent Notes, Due May Two Thousand Thirteen [Member]	Dec. 31, 2012 Five Point Six Two Five Percent Notes, Due March Two Thousand Fourteen [Member]	Dec. 31, 2011 Five Point Six Two Five Percent Notes, Due March Two Thousand Fourteen [Member]	Mar. 31, 2009 Five Point Six Two Five Percent Notes, Due March Two Thousand Fourteen [Member]	Nov. 23, 2010 Two Point Six Percent Notes, Due November Two Thousand Fifteen [Member]	Dec. 31, 2012 Five Point Seven Five Percent Notes, Due March Two Thousand Eighteen [Member]	Dec. 31, 2011 Five Point Seven Five Percent Notes, Due March Two Thousand Eighteen [Member]	Mar. 31, 2008 Five Point Seven Five Percent Notes, Due March Two Thousand Eighteen [Member]	Dec. 31, 2012 Four Point Two Percent Notes, Due July Two Thousand Eighteen [Member]	Dec. 31, 2011 Four Point Two Percent Notes, Due July Two Thousand Eighteen [Member]	Jun. 30, 2003 Four Point Two Percent Notes, Due July Two Thousand Eighteen [Member]	Dec. 31, 2012 Six Point Five Percent Notes, Due March Two Thousand Nineteen [Member]	Dec. 31, 2011 Six Point Five Percent Notes, Due March Two Thousand Nineteen [Member]	Mar. 31, 2009 Six Point Five Percent Notes, Due March Two Thousand Nineteen [Member]	Nov. 23, 2010 Four Point Zero Three Percent Notes, Due November Two Thousand Twenty [Member]	Nov. 23, 2010 Four Point One Eight Percent Notes, Due November Two Thousand Twenty Two [Member]	Dec. 31, 2012 Private Placement [Member]	Dec. 31, 2012 Term Loan [Member]	Dec. 31, 2012 Line of Credit [Member]	Dec. 31, 2012 Private Placement Notes [Member]
Gain (Loss) on Fair Value Hedges Recognized in Earnings				$ 8.4	$ 53.2
Debt Instrument, Unamortized Discount (Premium), Net															1.0	3.7
Average annual interest rates			10.50%	8.60%	10.50%
Bank overdrafts			17.4	35.9	17.4
Obligations under capital leases			15.3	13.9	15.3
Other financing obligations			62.2	61.7	62.2
Net unrealized gains on debt with fair value hedges				93.1	147.6
Principal Amount of Debt	850.0	500.0							100.0					250.0			125.0			500.0	142.0			250.0			250.0			350.0	290.0	103.0
Minimum compliance of interest coverage ratio, numerator																																		4	4	4
Minimum compliance of interest coverage ratio, denominator																																			1	1
Revolving Credit Facility interest coverage ratio add back maximum of restructuring or legal or regulatory action				400.0
Revolving credit facility draw down amount without violating covenant				250.0
interest coverage ratio numerator actual																																	4.25		6.64
interest coverage ratio denominator actual																																	1		1
Goodwill, Impairment Loss				116.1
Net proceeds used to repay outstanding debt	837.6	496.3
Unamortized discount to face value													0.1					0.6	1.2			0.4	0.5		0.4	0.5		2.7	3.1
Interest rate, stated percentage									6.25%					4.80%			4.625%			5.625%	2.60%			5.75%			4.20%			6.50%	4.03%	4.18%
Debt issued for cash									4.0
Line of Credit Facility, Maximum Borrowing Capacity				1,000.0
Commercial Paper				0
Commercial Paper Program				1,000.0
Credit facility annual fee				2.0
Letters of credit outstanding			23.4	21.4	23.4
Future Minimum Sublease Rentals, Sale Leaseback Transactions			58.5	48.4	58.5
Percentage of Debt Hedged by Interest Rate Derivatives			74.00%	62.00%	74.00%
Notional Amount Related to Discontinuation of Interest Rate Fair Value Hedge							1,000.0	350.0
Line of Credit Facility, Initial Borrowing Capacity																																		500.0
Term loan incremental draw down																																		50.0
Long-term Line of Credit, Noncurrent										550.0	0																							550.0
Minimum Compliance Interest Coverage Ratio Denominator																																		1
Maximum leverage ratio numerator March 2013																																	4	4
Maximum leverage ratio denominatorMarch 2013																																	1	1
Maximum leverage ratio numerator Dec 2013																																		3.75
Maximum leverage ratio denominator Dec 2013																																		1
Maximum leverage ratio denominator March 2014																																	1	1
Long-term Debt, Maturities, Repayment Terms																																		Pursuant to the term loan agreement, we are required to repay an amount equal to 25% of the aggregate principal amount of the term loan on June 29, 2014, and the remaining outstanding principal amount of the term loan on June 29, 2015
Term Loan prepayment percentage of proceeds received from incurrence of debt				50.00%
Amount in excess requiring prepayment of Term Loan				500.0
Incremental impairment charge to add back to interest coverage ratio				125.0
Notes Payable, Noncurrent												250.0	249.9		124.0	121.3		499.4	498.8			249.6	249.5		249.6	249.5		347.3	346.9				535.0
Maximum leverage ratio numerator March 2014																																	3.75	3.5
Impairment of goodwill and intangible asset			263.0	253.0	263.0	0
Private Notes prepayment percent				100.00%
Private Notes accrued interest to be paid March 2013				7.0
Private Notes Make Whole Premium				$ 65.0
Debt Instrument, Credit Rating				Our long-term credit ratings are Baa2 (Stable Outlook) with Moody's and BBB- (Negative Outlook) with S&P, which are on the low end of investment grade, and BB+ (Stable Outlook) with Fitch, which is below investment grade. In February 2013, Fitch lowered their long-term credit rating from BBB- (Negative Outlook) to BB+ (Stable Outlook) and Moody's lowered their long-term credit rating from Baa1 (Negative Outlook) to Baa2 (Stable Outlook).