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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

 
$
—