Subsequent Events (Details) (USD $)	3 Months Ended				3 Months Ended	12 Months Ended			3 Months Ended													12 Months Ended			24 Months Ended
	Mar. 31, 2012	Jun. 30, 2012 First Lien Revolving Credit Facility Due Two Thousand Seventeen [Member]	Apr. 19, 2012 First Lien Revolving Credit Facility Due Two Thousand Seventeen [Member]	Mar. 31, 2012 First Lien Revolving Credit Facility Due Two Thousand Thirteen [Member]	Jun. 30, 2012 Second Lien Term Loan Facility Due Two Thousand Nineteen [Member]	Apr. 18, 2013 Second Lien Term Loan Facility Due Two Thousand Nineteen [Member]	Apr. 19, 2012 Second Lien Term Loan Facility Due Two Thousand Nineteen [Member]	Mar. 31, 2012 Second Lien Term Loan Facility Due Two Thousand Fourteen [Member]	Jun. 30, 2012 Minimum [Member] First Lien Revolving Credit Facility Due Two Thousand Seventeen [Member]	Jun. 30, 2012 Maximum [Member] First Lien Revolving Credit Facility Due Two Thousand Seventeen [Member]	Jun. 30, 2012 Available Cash Plus Availability Under Credit Facility Greater Than 1000 Million [Member] First Lien Revolving Credit Facility Due Two Thousand Seventeen [Member]	Jun. 30, 2012 Available Cash Plus Availability Under Facility Less Than 1000 Million [Member] First Lien Revolving Credit Facility Due Two Thousand Seventeen [Member]	Apr. 19, 2012 Libor [Member] Second Lien Term Loan Facility Due Two Thousand Nineteen [Member]	Apr. 19, 2012 Libor [Member] Available Cash Plus Availability Under Credit Facility Greater Than 1000 Million [Member] First Lien Revolving Credit Facility Due Two Thousand Seventeen [Member]	Apr. 19, 2012 Libor [Member] Available Cash Plus Availability Under Facility Less Than 1000 Million [Member] First Lien Revolving Credit Facility Due Two Thousand Seventeen [Member]	Apr. 19, 2012 Alternative Base Rate [Member] Second Lien Term Loan Facility Due Two Thousand Fourteen [Member]	Apr. 19, 2012 Alternative Base Rate [Member] Available Cash Plus Availability Under Credit Facility Greater Than 1000 Million [Member] First Lien Revolving Credit Facility Due Two Thousand Seventeen [Member]	Apr. 19, 2012 Alternative Base Rate [Member] Available Cash Plus Availability Under Facility Less Than 1000 Million [Member] First Lien Revolving Credit Facility Due Two Thousand Seventeen [Member]	Apr. 19, 2012 Federal Fund Rate [Member] Second Lien Term Loan Facility Due Two Thousand Nineteen [Member]	Apr. 19, 2012 Federal Fund Rate [Member] Available Cash Plus Availability Under Credit Facility Greater Than 1000 Million [Member] First Lien Revolving Credit Facility Due Two Thousand Seventeen [Member]	Apr. 19, 2012 Libor Alternative Base Rate [Member] Available Cash Plus Availability Under Credit Facility Greater Than 1000 Million [Member] First Lien Revolving Credit Facility Due Two Thousand Seventeen [Member]	May 14, 2020 Seven Point Zero Percent Notes Due In Two Thousand Twenty Two[Member] [Member]	May 14, 2019 Seven Point Zero Percent Notes Due In Two Thousand Twenty Two[Member] [Member]	May 14, 2018 Seven Point Zero Percent Notes Due In Two Thousand Twenty Two[Member] [Member]	May 14, 2022 Seven Point Zero Percent Notes Due In Two Thousand Twenty Two[Member] [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 2,000,000,000	$ 1,500,000,000			$ 1,200,000,000	$ 1,200,000,000
Line of Credit Facility, Expiration Date		April 30, 2017			April 30, 2019
Debt Instrument, Basis Spread on Variable Rate													3.75%	1.50%	1.75%	2.75%	0.50%	0.75%	0.50%	0.50%	1.00%
Available Cash Plus Availability Under Facility									1,000,000,000	1,000,000,000
Line of Credit Facility, Commitment Fee Percentage											0.375%	0.25%
DebtInstrumentVariableRateBasisMinimum							1.00%
Redemption Price In Percentage						101.00%																101.167%	102.333%	103.50%	100.00%
Write-off Deferred Financing Costs	$ 27,000,000				$ 24,000,000