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Debt (Tables)
 3 Months Ended
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