Fair Value (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Investments in Available-for-sale Securities [Line Items]
Cost	$ 16.7	$ 24.2
Gross Unrealized Gains	2.9	5.6
Gross Unrealized Losses	0	(0.2)
Fair Value	19.6	29.6
Equity Securities [Member]
Investments in Available-for-sale Securities [Line Items]
Cost	0	3.7
Gross Unrealized Gains	0	2.2
Gross Unrealized Losses	0	0
Fair Value	0	5.9
Non-U.S. debt securities [Member]
Investments in Available-for-sale Securities [Line Items]
Cost	0	3.6
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(0.2)
Fair Value	0	3.4
Mutual funds [Member]
Investments in Available-for-sale Securities [Line Items]
Cost	16.7	16.9
Gross Unrealized Gains	2.9	3.4
Gross Unrealized Losses	0	0
Fair Value	19.6	20.3
DTA Bond [Member]
DTA bonds [Abstract]
Carrying value	43.2	43.2
Fair value	$ 43.0	$ 42.9

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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- 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.

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This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Debt (bills, notes or bonds) that are issued by the government of the United States which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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