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Summary of Significant Accounting Policies (Details 4) (Recurring, USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Level 1
Fair Value Measurement:
Marketable securities with Level 1 fair value inputs	$ 170.2	$ 417.0
Level 2
Fair Value Measurement:
Interest rate swap agreements and foreign currency forward contracts, gross liability balance	1.5	12.2
Interest rate swap agreements and foreign currency forward contracts, gross asset balance	$ 3.0	$ 14.9

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

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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