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Significant Accounting Policies (Details 3) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Level 1
Fair Value Measurement:
Marketable securities with Level 1 fair value inputs	$ 564.0	$ 511.3
Level 2
Fair Value Measurement:
Interest rate swap agreements, gross liability balance	16.4	27.6
Interest rate swap agreements, gross asset value	$ 2.6

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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