Debt and Other Financing (Debt) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Apr. 30, 2003	Dec. 31, 2011 Five Point One Two Five Percent Notes, Due January Two Thousand Eleven [Member]	Dec. 31, 2010 Five Point One Two Five Percent Notes, Due January Two Thousand Eleven [Member]	Jan. 31, 2006 Five Point One Two Five Percent Notes, Due January Two Thousand Eleven [Member]	Dec. 31, 2011 Four Point Eight Percent Notes, Due March Two Thousand Thirteen [Member]	Dec. 31, 2010 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, 2011 Four Point Six Two Five Percent Notes, Due May Two Thousand Thirteen [Member]	Dec. 31, 2010 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, 2011 Five Point Six Two Five Percent Notes, Due March Two Thousand Fourteen [Member]	Dec. 31, 2010 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]	Dec. 31, 2011 Zero Point Nine Three To Twelve Point Six Percent Due Through Two Thousand And Fifteen [Member]	Dec. 31, 2010 Zero Point Nine Three To Twelve Point Six Percent Due Through Two Thousand And Fifteen [Member]	Dec. 31, 2011 Two Point Six Percent Notes, Due November Two Thousand Fifteen [Member]	Dec. 31, 2010 Two Point Six Percent Notes, Due November Two Thousand Fifteen [Member]	Nov. 23, 2010 Two Point Six Percent Notes, Due November Two Thousand Fifteen [Member]	Dec. 31, 2011 Five Point Seven Five Percent Notes, Due March Two Thousand Eighteen [Member]	Dec. 31, 2010 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, 2011 Four Point Two Percent Notes, Due July Two Thousand Eighteen [Member]	Dec. 31, 2010 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, 2011 Six Point Five Percent Notes, Due March Two Thousand Nineteen [Member]	Dec. 31, 2010 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]	Dec. 31, 2011 Four Point Zero Three Percent Notes, Due November Two Thousand Twenty [Member]	Dec. 31, 2010 Four Point Zero Three Percent Notes, Due November Two Thousand Twenty [Member]	Nov. 23, 2010 Four Point Zero Three Percent Notes, Due November Two Thousand Twenty [Member]	Dec. 31, 2011 Four Point One Eight Percent Notes, Due November Two Thousand Twenty Two [Member]	Dec. 31, 2010 Four Point One Eight Percent Notes, Due November Two Thousand Twenty Two [Member]	Nov. 23, 2010 Four Point One Eight Percent Notes, Due November Two Thousand Twenty Two [Member]
Notes payable	$ 832.4	$ 214.1
Current portion of long-term debt	16.9	513.5
Total	849.3	727.6
Notes				0	500.0		249.9	249.8		121.3	118.7		498.8	498.3							249.5	249.4		249.5	249.4		346.9	346.4
Senior Notes																		142.0	142.0											290.0	290.0		103.0	103.0
Other																77.5	80.7
Total long-term debt	2,328.4	2,827.7
Adjustment for debt with fair value hedges	147.6	94.4
Less current portion	(16.9)	(513.5)
Total	$ 2,459.1	$ 2,408.6
Interest rate, stated percentage			6.25%			5.125%			4.80%			4.625%			5.625%					2.60%			5.75%			4.20%			6.50%			4.03%			4.18%
Interest rate, stated percentage, minimum	0.93%
Interest rate, stated percentage, maximum	12.60%