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Non-Operating Expense - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Pretax charge on unamortized financing costs of credit facility and deferred expense on related interest rate swaps | $ 0.4 |
Senior unsecured credit facility- revolving loan due 2021 |  |
Debt Instrument [Line Items] |  |
Face value | $ 700.0 | $ 700.0
Debt instrument, maturity year | 2021 |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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- Details
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