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Debt and Credit Arrangements (Tables) | 6 Months Ended
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Jun. 30, 2017
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 |  | June 30, 2017 |  | December 31, 2016
Book Value |  | Fair Value 1 |  | Book Value |  | Fair Value 1
2.25% Senior Notes due 2017 (less unamortized discount and issuance costs of $0.0 and $0.2, respectively) | 2.30% |  | $ | 299.8 |  |  | $ | 300.5 |  |  | $ | 299.4 |  |  | $ | 301.4 |
4.00% Senior Notes due 2022 (less unamortized discount and issuance costs of $1.5 and $1.2, respectively) | 4.13% |  | 247.3 |  |  | 259.0 |  |  | 247.0 |  |  | 258.4 |
3.75% Senior Notes due 2023 (less unamortized discount and issuance costs of $0.9 and $2.3, respectively) | 4.32% |  | 496.8 |  |  | 521.0 |  |  | 496.6 |  |  | 503.3 |
4.20% Senior Notes due 2024 (less unamortized discount and issuance costs of $0.7 and $2.8, respectively) | 4.24% |  | 496.5 |  |  | 526.6 |  |  | 496.2 |  |  | 511.6 |
Other notes payable and capitalized leases |  |  | 44.4 |  |  | 44.4 |  |  | 65.4 |  |  | 65.4 |
Total long-term debt |  |  | 1,584.8 |  |  |  |  | 1,604.6 |  |  |
Less: current portion |  |  | 301.7 |  |  |  |  | 323.9 |  |  |
Long-term debt, excluding current portion |  |  | $ | 1,283.1 |  |  |  |  | $ | 1,280.7 |  |  |
1 | See Note 11 for information on the fair value measurement of our long-term debt.

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