Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign currency derivatives, assets	$ 0.1	[1]	$ 0.2	[1]
Assets, Total	963.4		809.7
Foreign currency derivatives, liabilities	0.2	[1]	0.6	[1]
Liabilities, Total	0.2		2.0
Total Available-For-Sale Marketable Securities ST [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	781.5		693.4
Total Available-For-Sale Marketable Securities LT [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	6.7		6.3
Quoted Prices In Active Markets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign currency derivatives, assets	0	[1]	0	[1]
Assets, Total	258.5		258.6
Foreign currency derivatives, liabilities	0	[1]	0	[1]
Liabilities, Total	0		0
Quoted Prices In Active Markets (Level 1) [Member] | Total Available-For-Sale Marketable Securities ST [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	258.5		258.6
Quoted Prices In Active Markets (Level 1) [Member] | Total Available-For-Sale Marketable Securities LT [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	0		0
Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign currency derivatives, assets	0.1	[1]	0.2	[1]
Assets, Total	696.4		536.1
Foreign currency derivatives, liabilities	0.2	[1]	0.6	[1]
Liabilities, Total	0.2		2.0
Other Observable Inputs (Level 2) [Member] | Total Available-For-Sale Marketable Securities ST [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	521.2		426.1
Other Observable Inputs (Level 2) [Member] | Total Available-For-Sale Marketable Securities LT [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	0		0
Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign currency derivatives, assets	0	[1]	0	[1]
Assets, Total	8.5		15.0
Foreign currency derivatives, liabilities	0	[1]	0	[1]
Liabilities, Total	0		0
Unobservable Inputs (Level 3) [Member] | Total Available-For-Sale Marketable Securities ST [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	1.8		8.7
Unobservable Inputs (Level 3) [Member] | Total Available-For-Sale Marketable Securities LT [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	6.7		6.3
Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	162.6	[2]	102.3	[2]
Money Market Funds [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	[2]	0	[2]
Money Market Funds [Member] | Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	162.6	[2]	102.3	[2]
Money Market Funds [Member] | Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	[2]	0	[2]
Government And Agency Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	12.5	[2]	6.0	[2]
Available-for-sale marketable securities	345.8		334.8
Government And Agency Debt Securities [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	[2]	0	[2]
Available-for-sale marketable securities	251.0		244.2
Government And Agency Debt Securities [Member] | Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	12.5	[2]	6.0	[2]
Available-for-sale marketable securities	94.8		90.6
Government And Agency Debt Securities [Member] | Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	[2]	0	[2]
Available-for-sale marketable securities	0		0
Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	[2]	1.5	[2]
Available-for-sale marketable securities	362.1		302.1
Corporate Debt Securities [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	[2]	0	[2]
Available-for-sale marketable securities	7.5		14.4
Corporate Debt Securities [Member] | Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	[2]	1.5	[2]
Available-for-sale marketable securities	354.6		282.5
Corporate Debt Securities [Member] | Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	[2]	0	[2]
Available-for-sale marketable securities	0		5.2
Asset-Backed And Mortgage-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	73.6		56.5
Asset-Backed And Mortgage-Backed Securities [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	0		0
Asset-Backed And Mortgage-Backed Securities [Member] | Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	71.8		53.0
Asset-Backed And Mortgage-Backed Securities [Member] | Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	1.8		3.5
Auction Rate Securities - Municipal Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	3.4		3.3
Auction Rate Securities - Municipal Debt [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	0		0
Auction Rate Securities - Municipal Debt [Member] | Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	0		0
Auction Rate Securities - Municipal Debt [Member] | Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	3.4		3.3
Auction Rate Securities - Preferred [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	3.3		3.0
Auction Rate Securities - Preferred [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	0		0
Auction Rate Securities - Preferred [Member] | Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	0		0
Auction Rate Securities - Preferred [Member] | Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale marketable securities	3.3		3.0
Interest Rate Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Forward starting interest rate swap	0		1.4
Interest Rate Swap [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Forward starting interest rate swap	0		0
Interest Rate Swap [Member] | Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Forward starting interest rate swap	0		1.4
Interest Rate Swap [Member] | Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Forward starting interest rate swap	$ 0		$ 0

[1] Foreign currency derivative assets and foreign currency derivative liabilities are included in Prepaid expenses and other current assets and Accrued liabilities, respectively, on the Consolidated Statements of Financial Position. Refer to Note 18 of the Notes to Consolidated Financial Statements for disclosure of derivative assets and liabilities on a gross basis.

[2] Included in Cash and cash equivalents on the Consolidated Statements of Financial Position.