v2.4.0.6

Debt (Interest Rate Swaps) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Notional Amount of Interest Rate Fair Value Hedge, Terminated | $ 750.0 |  |
Original Maturity of Interest Rate Swaps Terminated, Date Range | Mar. 01, 2012 |  |
Original Maturity of Interest Rate Swaps Terminated, Date Range End | Apr. 01, 2013 |  |
Deferred Gain Loss On Discontinuation of Interest Rate Fair Value Hedge, Inception | 22.7 |  |
Mark-to-market adjustments | 35.8 | 42.3 |
Reduction of interest expense | 31.5 | 30.3 | 26.1
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge | 15.8 | 0 |
Interest Rate Swaps [Member] |  |  |
Principal amount of note | $ 250.0 |  |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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