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Debt (Tables) | 3 Months Ended
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Mar. 31, 2019
Debt Disclosure [Abstract] |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments |
(In millions) | March 31, 2019 |  | December 31, 2018
0.75% Senior Convertible Notes due 2022: |  |  |
Principal amount | $ | 400.0 |  |  | $ | 400.0 |
Unamortized debt discount | (47.7 | ) |  | (51.1 | )
Unamortized debt issuance costs | (5.9 | ) |  | (6.3 | )
Net carrying amount of Senior Convertible Notes due 2022 | 346.4 |  |  | 342.6 |
0.75% Senior Convertible Notes due 2023: |  |  |
Principal amount | 850.0 |  |  | 850.0 |
Unamortized debt discount | (164.0 | ) |  | (171.8 | )
Unamortized debt issuance costs | (10.0 | ) |  | (10.5 | )
Net carrying amount of Senior Convertible Notes due 2023 | 676.0 |  |  | 667.7 |
Total net carrying amount of senior convertible notes | $ | 1,022.4 |  |  | $ | 1,010.3 |
Fair value of outstanding senior convertible notes: |  |  |
Senior Convertible Notes due 2022 | $ | 537.5 |  |  | $ | 540.2 |
Senior Convertible Notes due 2023 | 876.3 |  |  | 859.6 |
Total fair value of outstanding senior convertible notes | $ | 1,413.8 |  |  | $ | 1,399.8 |
Amount by which the notes' if-converted value exceeds their principal amount: |  |  |
Senior Convertible Notes due 2022 | $ | 121.7 |  |  | $ | 125.4 |
Senior Convertible Notes due 2023 | — |  |  | — |
Total by which the notes' if-converted value exceeds their principal amount | $ | 121.7 |  |  | $ | 125.4 |

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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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