- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References+ Details

FINANCIAL INSTRUMENTS AND FINANCIAL RISK (Details) (USD $) In Millions, unless otherwise specified					6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Existing Notes	Dec. 31, 2011 Existing Notes	Jun. 30, 2012 Existing Notes LIBOR	Jun. 30, 2012 Fair value	Dec. 31, 2011 Fair value	Jun. 30, 2012 Fair value Existing Notes	Dec. 31, 2011 Fair value Existing Notes	Jun. 30, 2012 Carrying value Existing Notes	Dec. 31, 2011 Carrying value Existing Notes
Financial Instruments and financial risk
Short-term investment						$ 0.6	$ 3.3
Floating Rate Notes								328.4	316.0	325.0	325.0
Interest rate base					LIBOR
Interest rate margin (as a percent)					3.75%
Variable interest rate base floor (as a percent)					1.25%
Interest rate at period end (as a percent)			5.00%	5.00%
Accounts receivable allowance for uncollectible accounts	$ 0.3	$ 0.2