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Investments in Marketable Securities - Schedule of Available-For-Sale and Trading Securities (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Available-for-Sale
Cost	$ 94.0		$ 104.7
Unrealized Gains	59.2		77.6
Unrealized Losses	(1.5)		(1.8)
Fair Value	151.7		180.5
Trading
Cost	57.7		19.8
Unrealized Gains	4.1		1.9
Unrealized Losses	(5.3)		(2.3)
Fair Value	56.5		19.4
Investments in marketable securities	208.2		$ 199.9
Realized gains on investments classified as available-for-sale	$ 1.7	$ 0.1

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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