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Investments in Marketable Securities - Schedule of Available-For-Sale and Trading Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Available-for-Sale
Cost	$ 42.2		$ 66.1
Unrealized gains	24.6		17.6
Unrealized losses	0.0		(1.8)
Fair Value	66.8		81.9
Trading
Cost			41.0	$ 34.4
Unrealized gains	8.3	$ 6.6
Unrealized losses	(0.6)	(0.5)
Fair Value	48.7	40.5
Investments in marketable securities	115.5		$ 122.4
Proceeds from sale of available-for-sale securities	30.2	5.8
Realized gains (losses) on available-for-sale securities	$ 5.8	$ 1.7

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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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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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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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