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Fair value of financial instruments (Tables) | 9 Months Ended
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Sep. 30, 2019
Fair Value Disclosures [Abstract] |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | The fair value and carrying value of our fixed-rate debt are as follows:
(In millions) | September 30, 2019 |  | December 31, 2018
Senior unsecured notes |  |  |
Carrying value | $ | 600.0 |  |  | 600.0 |
Fair value | 613.0 |  |  | 519.9 |

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