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Debt Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Debt Instrument [Line Items] |  |  |  |
Cash payments paid for interest |  |  | $ 42.9 | $ 40.3
Amortization of net (loss) gain on treasury lock | $ 1.4 | $ 1.4 | 2.8 | 2.8
Amortization of financing costs | 0.4 | $ 0.5 | 0.9 | $ 0.9
Book value of fixed rate debt | 1,647.0 |  | 1,647.0 |
Book value of variable rate debt | 705.3 |  | 705.3 |
Long-term debt (fixed-rate debt), fair value | $ 1,693.9 |  | 1,693.9 |
Unsecured Debt | Seven-Year Term Loan, due October 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayment of debt |  |  | $ 3.3 |

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