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Fair Value Measurements (Details) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
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Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents and investments | $ 0 | $ 0
Carrying value |  |
Fair Value of Financial Instruments [Abstract] |  |
Debt | 2,179,100,000 | 2,215,300,000
Fair Value | Level 2 |  |
Fair Value of Financial Instruments [Abstract] |  |
Debt | $ 2,237,500,000 | $ 2,275,500,000

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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