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Debt and Credit Arrangements (Tables) | 3 Months Ended
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Mar. 31, 2019
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 |  | March 31, 2019 |  | December 31, 2018
Book Value |  | Fair Value 1 |  | Book Value |  | Fair Value 1
3.50% Senior Notes due 2020 (less unamortized discount and issuance costs of $0.7 and $2.2, respectively) | 3.89% |  | $ | 497.1 |  |  | $ | 504.3 |  |  | $ | 496.6 |  |  | $ | 499.9 |
3.75% Senior Notes due 2021 (less unamortized discount and issuance costs of $0.3 and $2.7, respectively) | 3.98% |  | 497.0 |  |  | 508.4 |  |  | 496.8 |  |  | 503.2 |
4.00% Senior Notes due 2022 (less unamortized discount and issuance costs of $1.0 and $0.7, respectively) | 4.13% |  | 248.3 |  |  | 255.2 |  |  | 248.2 |  |  | 250.3 |
3.75% Senior Notes due 2023 (less unamortized discount and issuance costs of $0.6 and $1.6, respectively) | 4.32% |  | 497.8 |  |  | 507.5 |  |  | 497.7 |  |  | 491.4 |
4.20% Senior Notes due 2024 (less unamortized discount and issuance costs of $0.5 and $2.1, respectively) | 4.24% |  | 497.4 |  |  | 515.0 |  |  | 497.3 |  |  | 492.6 |
4.65% Senior Notes due 2028 (less unamortized discount and issuance costs of $1.6 and $4.2, respectively) | 4.78% |  | 494.2 |  |  | 521.2 |  |  | 494.0 |  |  | 494.1 |
5.40% Senior Notes due 2048 (less unamortized discount and issuance costs of $2.8 and $5.5, respectively) | 5.48% |  | 491.7 |  |  | 505.4 |  |  | 491.7 |  |  | 474.1 |
Term Loan due 2021 - LIBOR plus 1.25% |  |  | 400.0 |  |  | 400.0 |  |  | 400.0 |  |  | 400.0 |
Other notes payable and capitalized leases |  |  | 40.3 |  |  | 40.3 |  |  | 38.0 |  |  | 38.0 |
Total long-term debt |  |  | 3,663.8 |  |  |  |  | 3,660.3 |  |  |
Less: current portion |  |  | 0.1 |  |  |  |  | 0.1 |  |  |
Long-term debt, excluding current portion |  |  | $ | 3,663.7 |  |  |  |  | $ | 3,660.2 |  |  |
1 | See Note 14 for information on the fair value measurement of our long-term debt.

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