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Earnings Per Share - Narrative (Details)
$ in Millions
9 Months Ended
Apr. 04, 2018
Mar. 27, 2018
Sep. 30, 2021
USD ($)
shares
Debt Instrument [Line Items]      
Conversion ratio (shares)     1
Sale or merger trigger conversion ratio (shares)     1
Prepaid Forward      
Debt Instrument [Line Items]      
Stock underlying the Prepaid Forward (shares)     1,858,500
Unsecured obligations | 2.50% Convertible notes due 2023      
Debt Instrument [Line Items]      
Aggregate principal amount | $     $ 125.5
Shares issued (shares)     0
Issuable upon conversion of the Notes (shares)     4,100,000
Conversion ratio 0.0323428 0.0323428