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Fair Value
12 Months Ended
Dec. 31, 2011
Fair Value [Abstract]  
Fair Value of Financial Instruments
(10)  
Fair Value

Roper's long-term debt at December 31, 2011 included $500 million of fixed-rate senior notes due 2019, with a fair value of approximately $583 million, and $500 million of fixed-rate senior notes due 2013, with a fair value of approximately $540 million, based on the trading prices of the notes.  Short-term debt included $67 million of fixed-rate convertible notes which were at fair value due to the short term nature of the debt. Most of Roper's other borrowings at December 31, 2011 were at various interest rates that adjust relatively frequently under its credit facility. The fair value for each of these borrowings at December 31, 2011 was estimated to be the face value of these borrowings.

In October 2009, Roper entered into interest rate swap agreements with an aggregate notional amount of $500 million.  The swaps are designated as fair value hedges and effectively changed the Company's $500 million senior notes due 2013 with a fixed interest rate of 6.625% to a variable rate obligation at a weighted average spread of 4.377% plus LIBOR.  The Company has determined the swaps to be Level 2 in the FASB fair value hierarchy.  To account for the fair value hedge, the swap is recorded at fair value in the balance sheet as an asset or liability, and the changes in fair values of both the interest rate swap and the hedged senior notes due 2013 are recorded as interest expense. The fair value of the swap was an asset balance of $11.6 million and $14.1 million at December 31, 2011 and 2010, respectively.  The corresponding change in the fair value of the notes being hedged was an increase of $11.7 million and $14.1 million at December 31, 2011 and 2010, respectively.  The impact on earnings was immaterial in the years ended December 31, 2011, 2010 and 2009.