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Derivative Instruments And Hedging Activities (Tables) | 12 Months Ended
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Dec. 31, 2011
Derivative [Line Items] |
Fair Value Of Derivative Financial Instruments And Their Classification In The Balance Sheet |
|  | September 30, |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | Fair Values of Derivative Instruments |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Asset Derivatives |  |  | Liability Derivatives |
|  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
|  | Balance Sheet Location |  |  | Fair Value |  |  | Balance Sheet Location |  |  | Fair Value |  |  | Balance Sheet Location |  |  | Fair Value |  |  | Balance Sheet Location |  |  | Fair Value |
Derivatives designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Other Liabilities |  |  | $ | — |  |  |  | Other Liabilities |  |  | $ | 36.9 |
Derivatives designated not as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Other Liabilities |  |  | $ | 16.6 |  |  |  | Other Liabilities |  |  | $ | — |
Interest Rate Cap |  |  | Other Assets |  |  | $ | 0.1 |  |  |  | Other Assets |  |  | $ | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect Of Derivative Financial Instruments On The Statements Of Income And Comprehensive Income |
Effect of Derivative Instruments |
Derivatives in Cash Flow Hedging Relationships |  | Unrealized Loss Recognized in Other Comprehensive Income ("OCI") on Derivative (Effective Portion) |  |  | Location of Loss Reclassified from Accumulated OCI into Income (Effective Portion) |  | Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion) |  |  | Location of Loss Recognized in Statement of Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) |  | Amount of Loss Recognized in Statement of Income (Discontinuation, Ineffective Portion and Amount Excluded from Effectiveness Testing) |
| 2011 |  |  | 2010 |  |  | 2009 |  |  |  | 2011 |  |  | 2010 |  |  | 2009 |  |  |  | 2011 |  |  | 2010 |
Interest Rate Swaps (1) |  | $ | (2.7 | ) |  | $ | (19.1 | ) |  | $ | (12.3 | ) |  | Interest Expense |  | $ | 9.9 |  |  | $ | 23.4 |  |  | $ | 22.2 |  |  | Loss on discontinuation of hedging relationship |  | $ | 29.8 |  |  | $ | — |
|  | September 30, |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
Derivatives Not Designated as Hedging Instruments |  | Location of Income (Loss) Recognized in Statement of Income |  | Amount of Income (Loss) Recognized in Statement of Income |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Interest Rate Cap |  | Other income/(loss) |  | $ | (0.1 | ) |  | $ | — |  |  | $ | — |
Interest Rate Swap |  | Other income/(loss) |  |  | (0.2 | ) |  |  | — |  |  |  | — |
(1) | The results include the interest rate swap gain (loss) prior to discontinuation in May 2011.
Not-Designated [Member] |
Derivative [Line Items] |
Schedule Of Outstanding Interest Rate Derivatives |
|  | September 30, |  | September 30,
Interest Rate Derivative |  | Number of Instruments |  | Notional Amount
Interest Rate Cap |  | 1 |  | $175.0 million
Interest Rate Swap |  | 1 |  | $500.0 million

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- Definition Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of interest rate derivatives, including, but not limited to, the fair value of the derivatives, statement of financial position location, and statement of financial performance location of these instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 815 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 4C -Section 50 -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 + Details
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