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Investments in Marketable Securities - Schedule of Available-For-Sale and Trading Securities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Available-for-Sale
Cost	$ 73.1		$ 73.1		$ 104.7
Unrealized Gains	36.0		36.0		77.6
Unrealized Losses	(1.5)		(1.5)		(1.8)
Fair Value	107.6		107.6		180.5
Trading
Cost	96.8		96.8		19.8
Unrealized Gains			5.2		1.9
Unrealized Losses			(6.0)		(2.3)
Fair Value	96.0		96.0		19.4
Investments in marketable securities	203.6		203.6		$ 199.9
Realized gains on investments classified as available-for-sale	$ 7.5	$ 7.9	$ 9.2	$ 7.9

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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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