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Debt - Summary of Long-Term Debt (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Debt Instrument [Line Items] |  |  |
Long-term debt, gross | $ 1,970.3 |  | $ 1,973.4
Long-term debt and other | 1,972.0 |  | 1,976.4
Debt issuance costs | (14.8) |  | (15.9)
Long-term debt and other, net | 1,957.2 |  | 1,960.5
Less — Current portion | (9.0) | [1] | (9.0)
Long-term debt | 1,948.2 | [1] | 1,951.5
Credit agreement | Term Loan Facility | Credit Agreement — Term Loan Facility |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | 245.3 |  | 248.4
Debt issuance costs | (1.6) |  | (1.8)
Long-term debt, net | $ 243.7 |  | $ 246.6
Debt instrument, interest rate, stated percentage | 3.49% |  | 3.00%
Senior notes | 5.375% Senior Notes due 2024 (2024 Notes) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | $ 325.0 |  | $ 325.0
Debt issuance costs | (2.2) |  | (2.4)
Long-term debt, net | $ 322.8 |  | $ 322.6
Debt instrument, interest rate, stated percentage | 5.375% |  | 5.375%
Senior notes | 5.25% Senior Notes due 2025 (2025 Notes) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | $ 650.0 |  | $ 650.0
Debt issuance costs | (5.4) |  | (5.8)
Long-term debt, net | $ 644.6 |  | $ 644.2
Debt instrument, interest rate, stated percentage | 5.25% |  | 5.25%
Senior notes | 3.8% Senior Notes due 2027 (2027 Notes) (1) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, net of unamortized discount before debt issuance costs | $ 745.1 |  | $ 744.9
Debt issuance costs | (5.6) |  | (5.9)
Long-term debt, net | $ 739.5 |  | $ 739.0
Debt instrument, interest rate, stated percentage | 3.80% |  |
Debt instrument, interest rate, effective percentage | 3.885% |  | 3.885%
Unamortized discount | $ 4.9 |  | $ 5.1
Other | Other |  |  |
Debt Instrument [Line Items] |  |  |
Other | 6.6 |  | 8.1
Debt issuance costs | $ 0.0 |  | $ 0.0
[1] | Unaudited.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt and capital lease obligations. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References No definition available. + Details
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 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(22)) -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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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