Fair Value Measurements (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Liabilities:
Derivative contracts	$ 24,900,000		$ 24,900,000		$ 12,200,000
Investments and Acquisitions at Fair Value
Net cash outflow to determine valuations	395,000,000		395,000,000		395,000,000
Discount rate used for net cash outflow projections for fair value measurement	5.70%		5.70%		6.10%
Fair value adjustment of contingent consideration	2,200,000		3,400,000
Fair value of venture capital investments
Beginning balance, January 1	20,500,000	20,800,000	20,800,000	21,900,000
Unrealized gains included in earnings	100,000		700,000
Unrealized losses included in earnings	(300,000)	(100,000)	(1,300,000)	(1,600,000)
Purchases	300,000	(300,000)	400,000	100,000
Issuances	0		0
Settlements	0		0
Ending balance, June 30	20,600,000	20,400,000	20,600,000	20,400,000
Summary of fair and carrying value of debt instruments
Notes payable, Carrying Value	1,070,900,000		1,070,900,000		1,077,700,000
Total	1,551,000,000		1,551,000,000		1,135,800,000
Fair Value Measurements (Textuals) [Abstract]
Venture capital investments as a percentage of our total assets	approximately 0.2% of total assets		approximately 0.2% of total assets		approximately 0.3% of total assets
Quoted Prices in Active Markets, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents, Fair Value Disclosure	0		0		0
Derivative contracts	0		0		0
Plan assets for deferred compensation	0		0		0
Total	2,000,000		2,000,000		44,800,000
Liabilities:
Derivative contracts	0		0		0
Acquisition-related Contingent consideration	0		0		0
Total	0		0		0
Fair Value Measurements (Additional Textuals) [Abstract]
Acquisition-related Contingent consideration	0		0		0
Quoted Prices in Active Markets, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	0		0		0
Quoted Prices in Active Markets, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Government securities [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	0		0		0
Quoted Prices in Active Markets, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage and other asset backed securities [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	0		0		0
Quoted Prices in Active Markets, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Strategic investments [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	2,000,000		2,000,000		44,800,000
Quoted Prices in Active Markets, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Venture capital investments [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	0		0		0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents, Fair Value Disclosure	440,600,000		440,600,000		651,800,000
Derivative contracts	500,000		500,000		1,300,000
Plan assets for deferred compensation	15,200,000		15,200,000		13,000,000
Total	2,269,100,000		2,269,100,000		1,857,300,000
Liabilities:
Derivative contracts	24,900,000		24,900,000		12,200,000
Acquisition-related Contingent consideration	0		0		0
Total	24,900,000		24,900,000		12,200,000
Fair Value Measurements (Additional Textuals) [Abstract]
Acquisition-related Contingent consideration	0		0		0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	475,100,000		475,100,000		313,000,000
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | Government securities [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	1,095,400,000		1,095,400,000		785,300,000
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | Mortgage and other asset backed securities [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	242,300,000		242,300,000		92,900,000
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | Strategic investments [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	0		0		0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | Venture capital investments [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	0		0		0
Significant Unobservable Inputs (Level 3)
Liabilities:
Acquisition-related Contingent consideration	84,600,000		84,600,000		81,200,000
Fair Value Measurements (Additional Textuals) [Abstract]
Acquisition-related Contingent consideration	84,600,000		84,600,000		81,200,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents, Fair Value Disclosure	0		0		0
Derivative contracts	0		0		0
Plan assets for deferred compensation	0		0		0
Total	20,600,000		20,600,000		20,800,000
Liabilities:
Derivative contracts	0		0		0
Acquisition-related Contingent consideration	84,600,000		84,600,000		81,200,000
Total	84,600,000		84,600,000		81,200,000
Fair Value Measurements (Additional Textuals) [Abstract]
Acquisition-related Contingent consideration	84,600,000		84,600,000		81,200,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	0		0		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring [Member] | Government securities [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	0		0		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring [Member] | Mortgage and other asset backed securities [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	0		0		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring [Member] | Strategic investments [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	0		0		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring [Member] | Venture capital investments [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	20,600,000		20,600,000		20,800,000
Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents, Fair Value Disclosure	440,600,000		440,600,000		651,800,000
Derivative contracts	500,000		500,000		1,300,000
Plan assets for deferred compensation	15,200,000		15,200,000		13,000,000
Total	2,291,700,000		2,291,700,000		1,922,900,000
Liabilities:
Derivative contracts	24,900,000		24,900,000		12,200,000
Acquisition-related Contingent consideration	84,600,000		84,600,000		81,200,000
Total	109,500,000		109,500,000		93,400,000
Fair Value Measurements (Additional Textuals) [Abstract]
Acquisition-related Contingent consideration	84,600,000		84,600,000		81,200,000
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	475,100,000		475,100,000		313,000,000
Fair Value, Measurements, Recurring [Member] | Government securities [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	1,095,400,000		1,095,400,000		785,300,000
Fair Value, Measurements, Recurring [Member] | Mortgage and other asset backed securities [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	242,300,000		242,300,000		92,900,000
Fair Value, Measurements, Recurring [Member] | Strategic investments [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	2,000,000		2,000,000		44,800,000
Fair Value, Measurements, Recurring [Member] | Venture capital investments [Member]
Assets:
Fair Value, Measured on Recurring Basis, Investments	20,600,000		20,600,000		20,800,000
Dompe [Member]
Summary of fair and carrying value of debt instruments
Notes payable, Fair Value	4,300,000		4,300,000		8,100,000
Notes payable, Carrying Value	4,300,000		4,300,000		8,000,000
Notes Payable to Fumedica [Member]
Summary of fair and carrying value of debt instruments
Notes payable, Fair Value	24,400,000		24,400,000		24,200,000
Notes payable, Carrying Value	21,700,000		21,700,000		22,000,000
6.0% Senior Notes due 2013 [Member]
Summary of fair and carrying value of debt instruments
Notes payable, Fair Value	482,900,000		482,900,000		485,500,000
Notes payable, Carrying Value	449,800,000		449,800,000		449,800,000
6.875% Senior Notes due 2018 [Member]
Summary of fair and carrying value of debt instruments
Notes payable, Fair Value	639,400,000		639,400,000		618,000,000
Notes payable, Carrying Value	$ 595,100,000		$ 595,100,000		$ 597,900,000