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Investments in Marketable Securities - Schedule of Available-For-Sale and Trading Securities (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Available-for-Sale
Cost	$ 106.4	$ 125.6
Unrealized Gains	47.0	42.8
Unrealized Losses	(3.8)	(18.1)
Fair Value	149.6	150.3
Trading
Cost	21.9	19.5
Unrealized Gains	1.9	2.9
Unrealized Losses	(1.6)	(0.1)
Fair Value	$ 22.2	$ 22.3

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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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