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Credit and Other Debt Agreements (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Summary of Corporate and Other Debt | The following is a summary of our corporate and other debt (in millions):
|  | December 31, |
|  | 2017 |  |  | 2016 |
Note Purchase Agreements: |  |  |  |  |  |  |  |
Semi-annual payments of interest, fixed rate of 6.44%, balloon due August 3, 2017 |  | $ | — |  |  | $ | 300.0 |
Semi-annual payments of interest, fixed rate of 2.80%, balloon due June 24, 2018 |  |  | 50.0 |  |  |  | 50.0 |
Semi-annual payments of interest, fixed rate of 5.85%, $50 million due November 30, 2018 and November 30, 2019 |  |  | 100.0 |  |  |  | 100.0 |
Semi-annual payments of interest, fixed rate of 3.20%, balloon due June 24, 2019 |  |  | 50.0 |  |  |  | 50.0 |
Semi-annual payments of interest, fixed rate of 3.48%, balloon due June 24, 2020 |  |  | 50.0 |  |  |  | 50.0 |
Semi-annual payments of interest, fixed rate of 3.99%, balloon due July 10, 2020 |  |  | 50.0 |  |  |  | 50.0 |
Semi-annual payments of interest, fixed rate of 5.18%, balloon due February 10, 2021 |  |  | 75.0 |  |  |  | 75.0 |
Semi-annual payments of interest, fixed rate of 3.69%, balloon due June 14, 2022 |  |  | 200.0 |  |  |  | 200.0 |
Semi-annual payments of interest, fixed rate of 5.49%, balloon due February 10, 2023 |  |  | 50.0 |  |  |  | 50.0 |
Semi-annual payments of interest, fixed rate of 4.13%, balloon due June 24, 2023 |  |  | 200.0 |  |  |  | 200.0 |
Quarterly payments of interest, floating rate of 90 day LIBOR plus 1.65%, balloon due August 2, 2023 |  |  | 50.0 |  |  |  | — |
Semi-annual payments of interest, fixed rate of 4.58%, balloon due February 27, 2024 |  |  | 325.0 |  |  |  | 325.0 |
Semi-annual payments of interest, fixed rate of 4.31%, balloon due June 24, 2025 |  |  | 200.0 |  |  |  | 200.0 |
Semi-annual payments of interest, fixed rate of 4.73%, balloon due February 27, 2026 |  |  | 175.0 |  |  |  | 175.0 |
Semi-annual payments of interest, fixed rate of 4.40%, balloon due June 2, 2026 |  |  | 175.0 |  |  |  | 175.0 |
Semi-annual payments of interest, fixed rate of 4.36%, balloon due June 24, 2026 |  |  | 150.0 |  |  |  | 150.0 |
Semi-annual payments of interest, fixed rate of 4.09%, balloon due June 27, 2027 |  |  | 125.0 |  |  |  | — |
Semi-annual payments of interest, fixed rate of 4.09%, balloon due August 2, 2027 |  |  | 125.0 |  |  |  | — |
Semi-annual payments of interest, fixed rate of 4.14%, balloon due August 4, 2027 |  |  | 98.0 |  |  |  | — |
Semi-annual payments of interest, fixed rate of 3.46%, balloon due December 1, 2027 |  |  | 100.0 |  |  |  | 100.0 |
Semi-annual payments of interest, fixed rate of 4.55%, balloon due June 2, 2028 |  |  | 75.0 |  |  |  | 75.0 |
Semi-annual payments of interest, fixed rate of 4.98%, balloon due February 27, 2029 |  |  | 100.0 |  |  |  | 100.0 |
Semi-annual payments of interest, fixed rate of 4.19%, balloon due June 27, 2029 |  |  | 50.0 |  |  |  | — |
Semi-annual payments of interest, fixed rate of 4.19%, balloon due August 2, 2029 |  |  | 50.0 |  |  |  | — |
Semi-annual payments of interest, fixed rate of 4.70%, balloon due June 2, 2031 |  |  | 25.0 |  |  |  | 25.0 |
Semi-annual payments of interest, fixed rate of 4.34%, balloon due June 27, 2032 |  |  | 75.0 |  |  |  | — |
Semi-annual payments of interest, fixed rate of 4.34%, balloon due August 2, 2032 |  |  | 75.0 |  |  |  | — |
Total Note Purchase Agreements |  |  | 2,798.0 |  |  |  | 2,450.0 |
Credit Agreement: |  |  |  |  |  |  |  |
Periodic payments of interest and principal, prime or LIBOR plus up to 1.45%, expires April 8, 2021 |  |  | 190.0 |  |  |  | 278.0 |
Premium Financing Debt Facility - expires May 18, 2019: |  |  |  |  |  |  |  |
Periodic payments of interest and principal, Interbank rates plus 1.05% for Facility B; plus 0.55% for Facilities C and D |  |  |  |  |  |  |  |
Facility B |  |  |  |  |  |  |  |
AUD denominated tranche |  |  | 116.4 |  |  |  | 100.7 |
NZD denominated tranche |  |  | 5.7 |  |  |  | 9.0 |
Facility C and D |  |  |  |  |  |  |  |
AUD denominated tranche |  |  | 18.5 |  |  |  | 5.6 |
NZD denominated tranche |  |  | 10.5 |  |  |  | 10.3 |
Total Premium Financing Debt Facility |  |  | 151.1 |  |  |  | 125.6 |
Total corporate and other debt |  |  | 3,139.1 |  |  |  | 2,853.6 |
Less unamortized debt acquisition costs on Note Purchase Agreements |  |  | (6.1 | ) |  |  | (5.4 | )
Net corporate and other debt |  | $ | 3,133.0 |  |  | $ | 2,848.2 |

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