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Financial Instruments (Details 1) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | $ 752.5 us-gaap_CashEquivalentsAtCarryingValue | $ 716.3 us-gaap_CashEquivalentsAtCarryingValue
Commercial paper |  |
Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | 10.3 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperMember | 54.2 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperMember
Overnight reverse repurchase agreements |  |
Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | 308.6 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_RepurchaseAgreementsMember | 305.0 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_RepurchaseAgreementsMember
Money market funds |  |
Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | 427.2 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 321.2 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember
Short-term debt securities |  |
Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | $ 6.4 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_DebtSecuritiesMember | $ 35.9 us-gaap_CashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_DebtSecuritiesMember

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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |