Fair Value Measurements (Financial Assets And (Liabilities) Measured At Fair Value On A Recurring Basis) (Details) - Recurring [Member] - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | $ 160.9 | $ 183.9 |
Time deposits | 660.9 | 501.9 |
Available-for-sale investment securities | 1,816.3 | 1,262.7 |
Investments | 2,477.2 | 1,764.6 |
Total | 2,591.3 | 1,847.8 |
U.S. Treasury And Agency Debt Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 524.7 | 544.7 |
Corporate And Other Debt Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 374 | 358.6 |
Certificates of Deposit and Commercial Paper [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 549.7 | 4.6 |
Asset-Backed Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 231.2 | 220.1 |
Municipal Debt Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 114.3 | 112.8 |
Mutual Funds [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 22.4 | 21.9 |
Money Market Funds [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 154.8 | 176.5 |
Commercial Paper [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 6.1 | 7.4 |
Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 154.8 | 176.5 |
Time deposits | 0 | |
Available-for-sale investment securities | 419.7 | 426.8 |
Investments | 419.7 | 426.8 |
Total | 574.5 | 603.3 |
Level 1 [Member] | U.S. Treasury And Agency Debt Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 419.7 | 426.8 |
Level 1 [Member] | Corporate And Other Debt Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 0 | |
Level 1 [Member] | Certificates of Deposit and Commercial Paper [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 0 | 0 |
Level 1 [Member] | Asset-Backed Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 0 | |
Level 1 [Member] | Municipal Debt Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 0 | |
Level 1 [Member] | Mutual Funds [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 0 | |
Level 1 [Member] | Money Market Funds [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 154.8 | 176.5 |
Level 1 [Member] | Commercial Paper [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 0 | |
Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 6.1 | 7.4 |
Time deposits | 660.9 | 501.9 |
Available-for-sale investment securities | 1,396.6 | 835.9 |
Investments | 2,057.5 | 1,337.8 |
Total | 2,016.8 | 1,244.5 |
Level 2 [Member] | U.S. Treasury And Agency Debt Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 105 | 117.9 |
Level 2 [Member] | Corporate And Other Debt Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 374 | 358.6 |
Level 2 [Member] | Certificates of Deposit and Commercial Paper [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 549.7 | 4.6 |
Level 2 [Member] | Asset-Backed Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 231.2 | 220.1 |
Level 2 [Member] | Municipal Debt Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 114.3 | 112.8 |
Level 2 [Member] | Mutual Funds [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 22.4 | 21.9 |
Level 2 [Member] | Commercial Paper [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 6.1 | 7.4 |
Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Time deposits | 0 | |
Available-for-sale investment securities | 0 | |
Investments | 0 | |
Total | 0 | 0 |
Level 3 [Member] | U.S. Treasury And Agency Debt Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 0 | |
Level 3 [Member] | Corporate And Other Debt Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 0 | |
Level 3 [Member] | Certificates of Deposit and Commercial Paper [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 0 | 0 |
Level 3 [Member] | Asset-Backed Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 0 | |
Level 3 [Member] | Municipal Debt Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 0 | |
Level 3 [Member] | Mutual Funds [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale investment securities | 0 | |
Level 3 [Member] | Commercial Paper [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 0 | |
Other Current Assets [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, assets | 11.4 | 2.7 |
Other Current Assets [Member] | Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, assets | 0 | |
Other Current Assets [Member] | Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, assets | 11.4 | 2.7 |
Other Current Assets [Member] | Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, assets | 0 | |
Accrued Expenses And Other Current Liabilities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, liabilities | (45.2) | (97.3) |
Accrued Expenses And Other Current Liabilities [Member] | Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, liabilities | 0 | |
Accrued Expenses And Other Current Liabilities [Member] | Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, liabilities | (45.2) | (97.3) |
Accrued Expenses And Other Current Liabilities [Member] | Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, liabilities | 0 | |
Other Noncurrent Assets [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, assets | 3.5 | 3.9 |
Other Noncurrent Assets [Member] | Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, assets | 0 | 0 |
Other Noncurrent Assets [Member] | Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, assets | 3.5 | 3.9 |
Other Noncurrent Assets [Member] | Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, assets | 0 | 0 |
Other Noncurrent Liabilities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, liabilities | (16.5) | (10) |
Other Noncurrent Liabilities [Member] | Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, liabilities | 0 | |
Other Noncurrent Liabilities [Member] | Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, liabilities | (16.5) | $ (10) |
Other Noncurrent Liabilities [Member] | Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, liabilities | $ 0 | |