Financing (Details 1) (USD $) In Millions	Dec. 31, 2010
Schedule of current maturities for long-term debt
2011	$ 0.1
2012	1,000.1
2013	0.1
2014	1,000.0
2015	0
Thereafter	500.0
Long Term Debt Maturities Total	$ 2,500.3

Long Term Debt Maturities.

Name:	esrx_LongTermDebtMaturities
Namespace Prefix:	esrx
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt maturities after year five following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

+ References