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Long-term Debt (Tables) | 9 Months Ended
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Sep. 30, 2018
Debt Disclosure [Abstract] |
Schedule of Long-term Debt | A summary of the Company's long-term debt follows:
(in millions) |  |  |  |  |  | Fair Value1 |  |
|  | September 30, 2018 |  | December 31, 2017 |  | September 30, 2018 |  | December 31, 2017
3.75% Notes due 2027 |  | $ | 600.0 |  | $ | 600.0 |  | $ | 570.3 |  | $ | 607.1
3.5% Notes due 2024 |  | 400.0 |  | 400.0 |  | 384.3 |  | 403.7
3.75% Notes due 2022 |  | 350.0 |  | 350.0 |  | 347.4 |  | 358.9
5.125% Notes due 2020 |  | 250.0 |  | 250.0 |  | 256.9 |  | 264.8
Unamortized discount, debt issuance costs, and other |  | (12.6) |  | (13.8) |  |  |  |
Total long term-debt |  | $ | 1,587.4 |  | $ | 1,586.2 |  |  |  |
1. The fair value is estimated based on current yield rates plus the Company’s estimated credit spread available for financings with similar terms and maturities. Based on these inputs, the debt instruments are classified as Level 2 in the fair value hierarchy.

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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