Financial Instruments (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions	Sep. 30, 2011
Company's financial assets and liabilities consist of interest rate swap agreements and marketable securities included in elective deferred compensation plan
Derivative financial instruments	$ 9.7
Marketable Securities	2.6
Level 1 [Member]
Company's financial assets and liabilities consist of interest rate swap agreements and marketable securities included in elective deferred compensation plan
Derivative financial instruments	0
Marketable Securities	2.6
Level 2 [Member]
Company's financial assets and liabilities consist of interest rate swap agreements and marketable securities included in elective deferred compensation plan
Derivative financial instruments	9.7
Marketable Securities	0
Level 3 [Member]
Company's financial assets and liabilities consist of interest rate swap agreements and marketable securities included in elective deferred compensation plan
Derivative financial instruments	0
Marketable Securities	$ 0