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Investments in Marketable Securities - Schedule of Available-For-Sale and Trading Securities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Available-for-Sale
Cost	$ 123.1us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis	$ 125.6us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Unrealized Gains	49.8us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax	42.8us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Unrealized Losses	(5.0)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax	(18.1)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Fair Value	167.9us-gaap_AvailableForSaleSecuritiesEquitySecurities	150.3us-gaap_AvailableForSaleSecuritiesEquitySecurities
Trading
Cost	21.9us-gaap_TradingSecuritiesCost	19.5us-gaap_TradingSecuritiesCost
Unrealized Gains	3.5us-gaap_TradingSecuritiesUnrealizedHoldingGain	2.9us-gaap_TradingSecuritiesUnrealizedHoldingGain
Unrealized Losses	(0.4)us-gaap_TradingSecuritiesUnrealizedHoldingLoss	(0.1)us-gaap_TradingSecuritiesUnrealizedHoldingLoss
Fair Value	$ 25.0us-gaap_TradingSecurities	$ 22.3us-gaap_TradingSecurities

X

- 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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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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Amount of unrealized holding gain before loss recognized in the income statement for investments in trading securities.

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