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Debt and Credit Arrangements (Tables) | 9 Months Ended
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Sep. 30, 2016
Debt Disclosure [Abstract] |
Summary of Carrying Amounts and Fair Values of Long-term Debt | A summary of the carrying amounts and fair values of our long-term debt is listed below.
| Effective Interest Rate |  | September 30, 2016 |  | December 31, 2015
Book Value |  | Fair Value 1 |  | Book Value |  | Fair Value 1
2.25% Senior Notes due 2017 (less unamortized discount and issuance costs of $0.2 and $0.5, respectively) | 2.30% |  | $ | 299.3 |  |  | $ | 301.5 |  |  | $ | 298.8 |  |  | $ | 299.3 |
4.00% Senior Notes due 2022 (less unamortized discount and issuance costs of $1.7 and $1.4, respectively) | 4.13% |  | 246.9 |  |  | 266.8 |  |  | 246.4 |  |  | 250.9 |
3.75% Senior Notes due 2023 (less unamortized discount and issuance costs of $1.0 and $2.6, respectively) | 4.32% |  | 496.4 |  |  | 524.9 |  |  | 496.0 |  |  | 484.8 |
4.20% Senior Notes due 2024 (less unamortized discount and issuance costs of $0.8 and $3.1, respectively) | 4.24% |  | 496.1 |  |  | 539.0 |  |  | 495.8 |  |  | 496.4 |
Other notes payable and capitalized leases |  |  | 69.1 |  |  | 69.1 |  |  | 75.2 |  |  | 75.2 |
Total long-term debt |  |  | 1,607.8 |  |  |  |  | 1,612.2 |  |  |
Less: current portion |  |  | 24.5 |  |  |  |  | 1.9 |  |  |
Long-term debt, excluding current portion |  |  | $ | 1,583.3 |  |  |  |  | $ | 1,610.3 |  |  |
1 | See Note 11 for information on the fair value measurement of our long-term debt.

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