Fair Value (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investments in Available-for-sale Securities [Line Items]
Cost	$ 16.9	$ 24.2
Gross Unrealized Gains	3.1	5.6
Gross Unrealized Losses	0	(0.2)
Fair Value	20.0	29.6
Fair Value of Non-U.S. Debt Securities Measured on Recurring Basis, Unobservable Input Reconciliation (Level 3), Calculation [Roll Forward]
Beginning balance	3.4	3.1	0
Total realized gains (losses) included in interest and other income	2.6	0	0
Total realized and unrealized gains (losses) included in other comprehensive income (loss)	0.3	0.3	(0.6)
Purchases	0	0	3.7
Sales	(6.3)	0	0
Ending balance	0	3.4	3.1
DTA Bond [Member]
DTA bonds [Abstract]
Carrying value	43.2	43.2
Fair value	44.0	42.9
Unsecured Notes Issued in a Private Placement [Member]
DTA bonds [Abstract]
Carrying value	100.0	0
Fair value	106.4	0
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	16.9	16.9
Gross Unrealized Gains	3.1	3.4
Gross Unrealized Losses	0	0
Fair Value	$ 20.0	$ 20.3

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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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-Name FASB Staff Position (FSP)

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-Paragraph 7

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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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This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

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- Definition

Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Sales that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

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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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