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Debt - Convertible Senior Notes (Details) - 0.625% Convertible Senior Notes (2025 Notes)
$ / shares in Units, $ in Millions
Jun. 01, 2020
USD ($)
D
$ / shares
Debt  
Principal amount | $ $ 535.0
Semi-annual interest rate 0.625%
Conversion rate, shares per $1,000 principal 8.1980
Conversion, number of shares of common stock | $ 4.4
Initial conversion price | $ / shares $ 121.98
Debt issuance costs | $ $ 10.4
Conversion of Notes, Holders  
Debt  
Number of trading days within 30 trading day period 20
Number of consecutive trading days 30
Stock price trigger per share | $ / shares $ 159.51
Stock price trigger, as a percentage of conversion price 130.00%
Number of consecutive business days after the 10 consecutive trading day period 5
Number of consecutive trading days before the five consecutive business days 10
Maximum threshold stock price, as a percentage of conversion price 98.00%
Conversion of Notes, Company  
Debt  
Number of trading days within 30 trading day period 20
Number of consecutive trading days 30
Stock price trigger, as a percentage of conversion price 130.00%