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Investments in Marketable Securities - Schedule of Available-For-Sale and Trading Securities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Available-for-Sale
Cost	$ 30.5		$ 66.1
Unrealized gains	10.8		17.6
Unrealized losses	0.0		(1.8)
Fair Value	41.3		81.9
Trading
Cost			$ 44.2	$ 34.4
Unrealized gains	8.5	$ 6.6
Unrealized losses	(1.6)	(0.5)
Fair Value	$ 51.1	$ 40.5

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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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-Publisher FASB
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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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This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for 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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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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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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