Investments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Auction rate securities, amortized cost	$ 0.3	$ 0.4	$ 0.3
Auction rate securities, gross unrealized gains		3.3	1.7
Auction rate securities, gross unrealized losses		0	0
Auction rate securities, fair value	2.0	3.7	2.0
Par Value Available For Sale Securities		23.4
Proceeds from Sale of Available-for-sale Securities		0	0	19.1
Gain on settlement of litigation related to ARS	(20.0)	0	20.0	0
Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Auction rate securities, amortized cost	0.3	0.4	0.3
Auction rate securities, gross unrealized gains		3.3	1.7
Auction rate securities, gross unrealized losses		0	0
Auction rate securities, fair value	2.0	3.7	2.0
Proceeds from Sale of Available-for-sale Securities				$ 19.1

Par Value Available For Sale Securities

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous 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 unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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