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Fair Value Of Assets And Liabilities - Schedule of Fair Value Measurements on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted cash | $ 40.0 | $ 31.2
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted cash | 0.0 | 0.0
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted cash | 0.0 | 0.0
Line of Credit | Term Loan B | 2017 Credit Agreement | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt | 0.0 | 0.0
Line of Credit | Term Loan B | 2017 Credit Agreement | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt | 396.0 | 400.0
Line of Credit | Term Loan B | 2017 Credit Agreement | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt | 0.0 | 0.0
Line of Credit | Revolver | 2017 Credit Agreement | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt |  | 0.0
Line of Credit | Revolver | 2017 Credit Agreement | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt |  | 239.0
Line of Credit | Revolver | 2017 Credit Agreement | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt |  | 0.0
Line of Credit | Swing line of credit | 2017 Credit Agreement | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt |  | 0.0
Line of Credit | Swing line of credit | 2017 Credit Agreement | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt |  | 3.0
Line of Credit | Swing line of credit | 2017 Credit Agreement | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt |  | 0.0
Senior Notes | 2028 Senior Notes | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt | 0.0 | 0.0
Senior Notes | 2028 Senior Notes | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt | 452.4 | 496.8
Senior Notes | 2028 Senior Notes | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt | 0.0 | 0.0
Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted cash | 40.0 | 31.2
Carrying Amount | Line of Credit | Term Loan B | 2017 Credit Agreement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt | 391.3 | 394.9
Carrying Amount | Line of Credit | Revolver | 2017 Credit Agreement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt |  | 239.0
Carrying Amount | Line of Credit | Swing line of credit | 2017 Credit Agreement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt |  | 3.0
Carrying Amount | Senior Notes | 2028 Senior Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt | 493.0 | 0.0
Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted cash | 40.0 | 31.2
Fair Value | Line of Credit | Term Loan B | 2017 Credit Agreement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt | 396.0 | 400.0
Fair Value | Line of Credit | Revolver | 2017 Credit Agreement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt |  | 239.0
Fair Value | Line of Credit | Swing line of credit | 2017 Credit Agreement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt |  | 3.0
Fair Value | Senior Notes | 2028 Senior Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value disclosure of debt | $ 452.4 | $ 496.8

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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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