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Debt (Tables)
 3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Summary of Issued Senior Unsecured Notes Long-term debt in connection with our senior unsecured notes (collectively, the "Notes"), net of underwriting discounts and offering expenses, consists of the following:
March 31,December 31,
(In millions)20212020
1.750% Senior Notes due September 2030
$1,239.0 $1,238.7 
2.800% Senior Notes due September 2050
739.9 739.8 
$1,978.9 $1,978.5