Note 6 - Fair Value Measurements Level 4 (Details) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Fair Value Measurements (Textuals)
Amount of restricted investments measured at fair value included in the balance of Government Securities			$ 0.6
Amount of restricted investments measured at fair value included in the balance of Corporate Debt Securities	2.1		2.7
Amount of restricted investments measured at fair value included in the balance of Money Market Funds	88.7		114.3
Amount of Restricted Investments Measured at Fair Value Included in Balance of Mutual Funds	1.1
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	3,217.4		2,244.8
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	2,244.1		1,441.7
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	973.3		803.1
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0		0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | US Government Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	395.3		235.7	[1]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	150.1		54.9	[1]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	245.2		180.8	[1]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0		0	[1]
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	348.3		219.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	270.8		208.9
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	77.5		10.1
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0		0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Government Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	10.1		47.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Government Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0		21.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Government Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	10.1		26.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Government Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0		0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial Paper [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	16.0		13.5
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	16.0		13.5
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0		0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Corporate Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	469.3	[2]	464.4	[3]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0	[2]	2.7	[3]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	469.3	[2]	461.7	[3]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0	[2]	0	[3]
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Certificates of Deposit [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	44.3		21.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	44.3		21.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0		0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Asset-backed Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	110.9		90.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	110.9		90.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0		0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Money Market Funds [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	1,823.2	[4]	1,154.2	[5]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	1,823.2	[4]	1,154.2	[5]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0	[4]	0	[5]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0	[4]	0	[5]
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Mutual Funds [Member]
Trading securities:
Total trading securities measured at fair value on a recurring basis	12.4	[6]	8.1
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member]
Trading securities:
Total trading securities measured at fair value on a recurring basis	12.4	[6]	8.1
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member]
Trading securities:
Total trading securities measured at fair value on a recurring basis	0	[6]	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mutual Funds [Member]
Trading securities:
Total trading securities measured at fair value on a recurring basis	0	[6]	0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Exchange Contract [Member]
Derivative assets:
Derivative assets measured at fair value on a recurring basis	2.3		0.4
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member]
Derivative assets:
Derivative assets measured at fair value on a recurring basis	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member]
Derivative assets:
Derivative assets measured at fair value on a recurring basis	2.3		0.4
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contract [Member]
Derivative assets:
Derivative assets measured at fair value on a recurring basis	0		0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Trading securities:
Total trading securities measured at fair value on a recurring basis	12.4		8.1
Available-for-sale securities:
Assets measured at fair value on a recurring basis	3,217.4		2,244.8
Derivative assets:
Derivative assets measured at fair value on a recurring basis	2.3		0.4
Total assets measured at fair value	3,232.1		2,253.3
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Trading securities:
Total trading securities measured at fair value on a recurring basis	12.4		8.1
Available-for-sale securities:
Assets measured at fair value on a recurring basis	2,244.1		1,441.7
Derivative assets:
Derivative assets measured at fair value on a recurring basis	0		0
Total assets measured at fair value	2,256.5		1,449.8
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Trading securities:
Total trading securities measured at fair value on a recurring basis	0		0
Available-for-sale securities:
Assets measured at fair value on a recurring basis	973.3		803.1
Derivative assets:
Derivative assets measured at fair value on a recurring basis	2.3		0.4
Total assets measured at fair value	975.6		803.5
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Trading securities:
Total trading securities measured at fair value on a recurring basis	0		0
Available-for-sale securities:
Assets measured at fair value on a recurring basis	0		0
Derivative assets:
Derivative assets measured at fair value on a recurring basis	0		0
Total assets measured at fair value	$ 0		$ 0

[1] Balance includes $0.6 million of restricted investments measured at fair market value, related to an acquisition completed in 2005. For additional information regarding the Company's restricted investments, see Note 5, Cash, Cash Equivalents, and Investments, under the heading “Restricted Cash.” Restricted investments are included in the restricted cash balance in the condensed consolidated balance sheet.

[2] Balance includes $2.1 million of restricted investments measured at fair market value, related to the Company's India Gratuity Trust.

[3] Balance includes $2.7 million of restricted investments measured at fair market value, related to the Company's India Gratuity Trust.

[4] Balance includes $88.7 million of restricted investments measured at fair market value, related to the Company's D&O trust.

[5] Balance includes $114.3 million of restricted investments measured at fair market value, related to the Company's D&O trust.

[6] Balance includes $1.1 million of restricted investments measured at fair market value, related to the Company's India Gratuity Trust.