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Debt - 2027 Notes (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from the issuance of senior notes |  |  | $ 744.7 | $ 0.0 | $ 0.0
Loss on extinguishment of debt |  | $ (21.2) | 21.2 | 0.0 | 14.3
Debt issuance costs |  |  | 11.9 | $ 0.0 | $ 0.0
Senior notes | 2027 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, aggregate principal amount |  |  | $ 750.0 |  |
Stated interest rate |  |  | 3.80% |  |
Percentage of debt redemption price |  |  | 99.294% |  |
Debt interest rate, effective percentage |  |  | 3.885% |  |
Proceeds from the issuance of senior notes | $ 744.7 |  |  |  |
Debt issuance costs |  |  | $ 6.0 |  |
Senior notes | 2027 Notes | Prior to June 15, 2027 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage of debt redemption price |  |  | 100.00% |  |
Senior notes | 2027 Notes | On or After June 15, 2027 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage of debt redemption price |  |  | 100.00% |  |
Senior notes | 2023 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, aggregate principal amount | $ 500.0 |  |  |  |
Stated interest rate |  |  | 4.75% | 4.75% |
Percentage of debt redemption price | 100.00% |  |  |  |
Make-whole premium | $ 17.0 |  |  |  |
Loss on extinguishment of debt |  |  | $ (21.2) |  |
Credit Agreement | Prior Term Loan Facility | Term Loan Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, aggregate principal amount | $ 500.0 |  |  |  |

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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 Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 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 Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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