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Debt - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2018 | Apr. 30, 2018 | Dec. 31, 2017 | Nov. 14, 2014
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on debt extinguishment | $ (7.1) |  | $ (25.7) |  |  |
Capitalization of financing costs | 3.6 |  | 3.6 |  |  |
Fair value of our indebtedness | 678.3 |  | 678.3 |  | $ 1,154.1 |
Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Available capacity for letters of credit | 300.0 |  | $ 300.0 |  | $ 130.0 | $ 130.0
Line of credit maturity period |  |  | 2019-09 |  |  |
2018 Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Available capacity for letters of credit |  |  |  | $ 300.0 |  |
Line of credit maturity period |  |  | 2023-04 |  |  |
Term Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument principal amount |  |  |  |  |  | $ 702.0
Term loan debt maturity period |  |  | 2020-09 |  |  |
Term debt final mandatory principal pre-payments |  | $ 0.3 |  |  |  |
Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on debt extinguishment | $ (18.6) |  |  |  |  |
2018 Term Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument principal amount |  |  |  | $ 680.0 |  |
Term loan debt maturity period |  |  | 2025-04 |  |  |
Interest rate description |  |  | Interest rate is reduced to LIBOR plus 3.00% |  |  |

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- Definition Debt instrument maturity month and year. + References No definition available. + Details
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- Definition Line of credit facility expiration period month and year. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + 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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