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Debt - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |
Cash payments paid for interest |  |  | $ 43.1 | $ 42.9 |
Amortization of treasury lock settlements |  | $ 1.4 | 2.8 | 2.8 |
Amortization of deferred financing costs | $ 0.5 | $ 0.4 | 0.9 | $ 0.9 |
Deferred finance costs, net | 11.5 |  | 11.5 |  |
Unsecured Debt | Seven-Year Term Loan, due October 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayment of debt |  |  | $ 3.3 |  |
Debt Instrument, Term |  |  | 7 years |  |
Senior Notes | Fixed-Rate Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Book value of fixed rate debt | 1,650.0 |  | $ 1,650.0 |  |
Long-term debt (fixed-rate debt), fair value | 1,773.0 |  | 1,773.0 |  |
Term Loan | Variable-Rate Term Loans |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Book value of variable rate debt | $ 658.8 |  | $ 658.8 |  |
Adjustments for ASU 2015-03 | Other Long-term Assets |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Deferred finance costs, net |  |  |  |  | $ (12.3)

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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 Amount, after 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 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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