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Debt and Credit Arrangements (Tables) | 9 Months Ended
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Sep. 30, 2018
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, 2018 |  | December 31, 2017
Book Value |  | Fair Value 1 |  | Book Value |  | Fair Value 1
3.50% Senior Notes due 2020 (less unamortized discount and issuance costs of $0.9 and $2.9, respectively) | 3.89% |  | $ | 496.2 |  |  | $ | 500.1 |  |  | $ | — |  |  | $ | — |
3.75% Senior Notes due 2021 (less unamortized discount and issuance costs of $0.3 and $3.2, respectively) | 3.98% |  | 496.5 |  |  | 500.8 |  |  | — |  |  | — |
4.00% Senior Notes due 2022 (less unamortized discount and issuance costs of $1.1 and $0.9, respectively) | 4.13% |  | 248.0 |  |  | 249.9 |  |  | 247.6 |  |  | 259.0 |
3.75% Senior Notes due 2023 (less unamortized discount and issuance costs of $0.7 and $1.8, respectively) | 4.32% |  | 497.5 |  |  | 494.9 |  |  | 497.1 |  |  | 513.2 |
4.20% Senior Notes due 2024 (less unamortized discount and issuance costs of $0.6 and $2.3, respectively) | 4.24% |  | 497.1 |  |  | 501.6 |  |  | 496.7 |  |  | 524.2 |
4.65% Senior Notes due 2028 (less unamortized discount and issuance costs of $1.7 and $4.4, respectively) | 4.78% |  | 493.9 |  |  | 500.6 |  |  | — |  |  | — |
5.40% Senior Notes due 2048 (less unamortized discount and issuance costs of $2.8 and $5.6, respectively) | 5.48% |  | 491.6 |  |  | 497.3 |  |  | — |  |  | — |
Other notes payable and capitalized leases |  |  | 40.7 |  |  | 40.7 |  |  | 46.2 |  |  | 46.2 |
Total long-term debt |  |  | 3,261.5 |  |  |  |  | 1,287.6 |  |  |
Less: current portion |  |  | 0.1 |  |  |  |  | 2.0 |  |  |
Long-term debt, excluding current portion |  |  | $ | 3,261.4 |  |  |  |  | $ | 1,285.6 |  |  |
1 | See Note 13 for information on the fair value measurement of our long-term debt.
Summary of New Debt Issuance [Table Text Block] | The issuance was comprised of the following four series of notes:
Senior Notes |  | Par Value |  | Discount at Issuance |  | Net Price at Issuance |  | Issuance Cost |  | Net Proceeds
3.50% Senior Notes Due 2020 |  | $ | 500.0 |  |  | $ | 1.0 |  |  | $ | 499.0 |  |  | $ | 2.9 |  |  | $ | 496.1 |
3.75% Senior Notes Due 2021 |  | 500.0 |  |  | 0.3 |  |  | 499.7 |  |  | 3.2 |  |  | 496.5 |
4.65% Senior Notes Due 2028 |  | 500.0 |  |  | 1.7 |  |  | 498.3 |  |  | 4.4 |  |  | 493.9 |
5.40% Senior Notes Due 2048 |  | 500.0 |  |  | 2.8 |  |  | 497.2 |  |  | 5.6 |  |  | 491.6 |
Total |  | $ | 2,000.0 |  |  | $ | 5.8 |  |  | $ | 1,994.2 |  |  | $ | 16.1 |  |  | $ | 1,978.1 |

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