XML 41 R24.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Debt (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Debt Disclosure [Abstract] |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | Senior Convertible Notes The carrying amounts of our senior convertible notes were as follows as of the dates indicated:
| December 31,
(In millions) | 2018 |  | 2017
0.75% Senior Convertible Notes due 2022: |  |  |
Principal amount | $ | 400.0 |  |  | $ | 400.0 |
Unamortized debt discount | (51.1 | ) |  | (64.4 | )
Unamortized debt issuance costs | (6.3 | ) |  | (8.0 | )
Net carrying amount of Senior Convertible Notes due 2022 | 342.6 |  |  | 327.6 |
0.75% Senior Convertible Notes due 2023: |  |  |
Principal amount | 850.0 |  |  | — |
Unamortized debt discount | (171.8 | ) |  | — |
Unamortized debt issuance costs | (10.5 | ) |  | — |
Net carrying amount of Senior Convertible Notes due 2023 | 667.7 |  |  | — |
Total net carrying amount of senior convertible notes | $ | 1,010.3 |  |  | $ | 327.6 |
Fair value of outstanding notes: |  |  |  |  |
Senior Convertible Notes due 2022 | $ | 540.2 |  |  | $ | 381.3 |
Senior Convertible Notes due 2023 | 859.6 |  |  | — |
Total fair value of outstanding senior convertible notes | $ | 1,399.8 |  |  | $ | 381.3 |
Amount by which the notes’ if-converted value exceeds their principal amount: |  |  |
Senior Convertible Notes due 2022 | $ | 125.4 |  |  | $ | — |
Senior Convertible Notes due 2023 | — |  |  | — |
Total by which the notes’ if-converted value exceeds their principal amount | $ | 125.4 |  |  | $ | — |

X
- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration