Debt and Other Financing (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended			3 Months Ended	1 Months Ended		3 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014	Jul. 31, 2013	Mar. 31, 2013	Jun. 30, 2014	Apr. 15, 2013	Mar. 29, 2013	Mar. 31, 2008	May 31, 2003	Jun. 30, 2009	Jun. 30, 2003	Sep. 30, 2012	Jun. 30, 2012
Short-term Debt, Weighted Average Interest Rate			4.20%	6.50%
Obligations under capital leases			$ 11,600,000	$ 11,600,000
Other financing obligations			45,800,000	56,300,000
Sale and leaseback			40,400,000	44,500,000
2014 Notes prepayment percent										100.00%
2014 Notes accrued interest paid April 2013										3,400,000
Loss on extinguishment of debt		(73,000,000)	0	(86,000,000)	0
2014 Notes Make Whole Premium										21,700,000
2014 Notes acceleration of interest-rate swap gain	9,800,000
Private Notes Make Whole Premium											68,000,000
Amount remaining for the other items to be added back to net income under covenant			10,000,000
Revolving credit facility draw down amount without violating covenant			825,000,000
Letters of credit outstanding			12,900,000	19,900,000
Credit ratings			Our long-term credit ratings are Ba1 (Stable Outlook) with Moody's, BB+ (Stable Outlook) with S&P, and BB (Negative Outlook) with Fitch, which are below investment grade.
Two Point Three Seven Five Percent Notes, Due March Two Thousand Sixteen [Member]
Interest rate, stated percentage		2.375%						2.375%
Principal Amount of Debt		250,000,000						250,000,000
Unamortized discount to face value			100,000	100,000
Private Senior Notes			249,900,000	249,900,000
Four Point Six Zero Percent Notes, Due March Two Thousand Twenty [Member]
Interest rate, stated percentage		4.60%						4.60%
Principal Amount of Debt		500,000,000						500,000,000
Unamortized discount to face value			600,000	700,000
Private Senior Notes			499,400,000	499,300,000
Five Point Zero Percent Notes, Due March Two Thousand Twenty-Three [Member]
Interest rate, stated percentage		5.00%						5.00%
Principal Amount of Debt		500,000,000						500,000,000
Unamortized discount to face value			4,000,000	4,500,000
Private Senior Notes			496,000,000	495,500,000
Term Loan [Member]
Line of credit facility			0	52,500,000
Four Point Eight Percent Notes, Due March Two Thousand Thirteen [Member]
Interest rate, stated percentage												4.80%
Principal Amount of Debt												250,000,000
Four Point Six Two Five Percent Notes, Due May Two Thousand Thirteen [Member]
Interest rate, stated percentage													4.625%
Principal Amount of Debt													125,000,000
Five Point Six Two Five Percent Notes, Due March Two Thousand Fourteen [Member]
Interest rate, stated percentage														5.625%
Principal Amount of Debt														500,000,000
Loss on extinguishment of debt	(13,000,000)
Write off of Deferred Debt Issuance Cost	1,100,000
Five Point Seven Five Percent Notes, Due March Two Thousand Eighteen [Member]
Interest rate, stated percentage												5.75%
Principal Amount of Debt												250,000,000
Unamortized discount to face value			300,000	400,000
Private Senior Notes			249,700,000	249,600,000
Four Point Two Percent Notes, Due July Two Thousand Eighteen [Member]
Interest rate, stated percentage															4.20%
Principal Amount of Debt															250,000,000
Unamortized discount to face value			300,000	400,000
Private Senior Notes			249,700,000	249,600,000
Six Point Five Percent Notes, Due March Two Thousand Nineteen [Member]
Interest rate, stated percentage														6.50%
Principal Amount of Debt														350,000,000
Unamortized discount to face value			1,800,000	2,300,000
Private Senior Notes			348,200,000	347,700,000
Six Point Nine Five Percent Notes, Due March Two Thousand Forty-Three [Member]
Interest rate, stated percentage		6.95%						6.95%
Principal Amount of Debt		250,000,000						250,000,000
Unamortized discount to face value			700,000	700,000
Private Senior Notes			249,300,000	249,300,000
Revolving Credit Facility [Member]
Line of credit facility			1,000,000,000
Credit facility annual fee			3,000,000
Amount outstanding under the revolving credit facility			0
Commercial Paper Program			1,000,000,000
2010 Revolving Credit Facility [Member]
Write off of Deferred Debt Issuance Cost		1,200,000
Line of credit facility					1,000,000,000
Revolving credit facility and term loan agreement [Member]
Limits of subsidiary debt plus existing at February 28, 2013			500,000,000
Revolving Credit Facility interest coverage ratio add back maximum of restructuring or legal or regulatory action			400,000,000
Private Placement [Member]
Loss on extinguishment of debt		(71,400,000)
Write off of Deferred Debt Issuance Cost						3,400,000
Private Senior Notes											535,000,000
Maximum leverage ratio numerator Dec 2014			3.5
Maximum leverage ratio denominator Dec 2014			1
Term Loan [Member]
Loss on extinguishment of debt		(1,600,000)
Repayments of Long-term Debt							117,500,000	380,000,000	52,500,000
Line of credit facility																	500,000,000
Term loan incremental draw down																50,000,000
Term Loan [Member] | Long-term Debt [Member]
Repayments of Long-term Debt									$ 39,400,000
Line of Credit [Member]
Minimum compliance of interest coverage ratio, numerator			4
Minimum compliance of interest coverage ratio, denominator			1