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Represents the entity's future capital commitments related to a limited partner investment.

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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 profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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For investments in debt and equity securities accounted for at cost, the excess of net sale proceeds over the carrying amount of investments disposed of during the period.

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Income derived from investments in equity securities representing a distribution of earnings to shareholders by the investee companies.

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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

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The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, beyond the current operating cycle.

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Investments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Investments
Carrying Value	$ 922.1	$ 1,072.8
Available-for-sale securities
Book cost basis	200.9	315.6
Gross unrealized gains	412.4	438.3
Gross unrealized losses	(1.9)	(4.3)
Unrealized gain - foreign currency exchange rates	0.1	23.4
Market value	611.5	773.0
Proceeds from sale of investments	375.8	256.3	233.6
Gross realized gains	151.7	27.5	68.7
Gross realized losses	3.6	5.7	3.0
Unrealized losses related to other than temporary investment impairments	2.4	3.8	1.3
Other than Temporary impairment
Lower of cost or market valuation adjustments on cost method investments	8.3	1.7	1.7
Common Stock
Fair value of investments by the length of time that the securities have been in a continuous loss position
Less than 12 months	25.7
Total	25.7
Unrealized losses of investments by the length of time that the securities have in a continuous loss position
Less than 12 months	1.9
Total	1.9
Cost method, private equity and other investments
Other than Temporary impairment
Cash Proceeds and Gain on Sale of Investments	187.1
Cash dividend received	48.4
Cash Proceeds on Sale of Investments	138.7
State Street Corporation
Available-for-sale securities
Proceeds from sale of investments	35.7
Gross realized gains	29.1
Number of shares sold	0.8
Computershare Ltd.
Available-for-sale securities
Proceeds from sale of investments	127.4
Gross realized gains	53.6
Number of shares sold	15.0
Euronet Worldwide
Available-for-sale securities
Proceeds from sale of investments	41.0
Gross realized gains	31.3
Number of shares sold	1.9
Private equity funds
Investments
Carrying Value	231.4	221.5
Future capital commitments
Future capital commitments related to private equity fund investments	12.4
Available-for-sale securities
Investments
Carrying Value	611.5	773.0
Available-for-sale securities \| State Street Corporation
Investments
Carrying Value	436.3	416.4
Available-for-sale securities \| Computershare Ltd.
Investments
Carrying Value		122.7
Available-for-sale securities \| Euronet Worldwide
Investments
Carrying Value		34.8
Available-for-sale securities \| Other available-for-sale securities
Investments
Carrying Value	175.2	199.1
Other investments
Investments
Carrying Value	310.6	299.8
Other investments \| Trading securities
Investments
Carrying Value	46.8	39.9
Other investments \| Held-to-maturity
Investments
Carrying Value	14.9	15.4
Other investments \| Cost method, private equity and other investments
Investments
Carrying Value	$ 248.9	$ 244.5