Quarterly report pursuant to Section 13 or 15(d)

(2.0% Convertible Senior Notes Due 2025) (Details)

v3.20.1
(2.0% Convertible Senior Notes Due 2025) (Details) - 2.0% Convertible Senior Notes Due 2025 [Member]
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended
Feb. 29, 2020
USD ($)
$ / shares
shares
Debt Instrument [Line Items]  
Face amount $ 400.0
Interest rate, stated percentage 2.00%
Conversion ratio 0.0094469
Conversion premium 50.00%
Last reported sale price used to calculate conversion premium | $ / shares $ 70.57
Maximum number of shares issuable upon conversion | shares 3.8
Carrying amount of the equity component $ 33.9
Unamortized debt discount balance $ 32.8
Debt discount amortization period 5 years
Effective interest rate 4.30%
Redemption, Redeem For Cash [Member]  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%
Redemption, Defined Changes of Control [Member]  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%