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Long-Term Debt (Details) - USD ($) $ in Millions | Nov. 07, 2012 | Dec. 31, 2018 | Jun. 30, 2018 | Jun. 07, 2018
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Long-Term Debt (Additional Textual) [Abstract] |  |  |  |
Fixed rate at fair market value |  | $ 597.5 | $ 996.4 |
2018 Credit Agreement [Member] |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |
Borrowing outstanding under 2018 Credit Agreement |  | $ 0.0 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 700.0
2.650% Senior Notes due 2019 [Member] |  |  |  |
Long-Term Debt (Additional Textual) [Abstract] |  |  |  |
Proceeds from Issuance of Senior Long-term Debt | $ 400.0 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.65% |  |  |

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- Definition Long term debt and capital leases. + References No definition available. + Details
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- Definition Long term debt and capital leases. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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