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Debt - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |
Cash payments paid for interest | $ 15.8 | $ 15.9 |
Amortization of treasury lock settlements | 1.4 | 1.4 |
Amortization of deferred financing costs | 0.4 | $ 0.4 |
Deferred finance costs, net | 11.9 |  |
Unsecured Debt | Seven-Year Term Loan, due October 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Repayment of debt | $ 1.6 |  |
Debt Instrument, Term | 7 years |  |
Senior Notes | Fixed-Rate Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Book value of fixed rate debt | $ 1,650.0 |  |
Long-term debt (fixed-rate debt), fair value | 1,744.6 |  |
Term Loan | Variable-Rate Term Loans |  |  |
Debt Instrument [Line Items] |  |  |
Book value of variable rate debt | $ 660.4 |  |
Adjustments for ASU 2015-03 | Long-term Debt |  |  |
Debt Instrument [Line Items] |  |  |
Deferred finance costs, net |  |  | $ 12.3
Adjustments for ASU 2015-03 | Other Long-term Assets |  |  |
Debt Instrument [Line Items] |  |  |
Deferred finance costs, net |  |  | $ (12.3)

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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. + 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=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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