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Debt (Tables)
 12 Months Ended
Dec. 31, 2021
Debt [Abstract]  
Long-Term Debt Long-term debt was (in millions):
December 31,
20212020
3.625% Senior Notes due 2022
$— $1,250.0 
3.65% Senior Notes due 2024
750.0 750.0 
3.60% Senior Notes due 2026
1,400.0 1,400.0 
€500 Million 0.80% Senior Notes due 2027
568.6 611.5 
2.45% Senior Notes due 2030
600.0 600.0 
4.20% Senior Notes due 2030
600.0 600.0 
€500 Million 1.40% Senior Notes due 2031
568.6 611.5 
2.60% Senior Notes due 2031
800.0 — 
£325 Million 2.25% Senior Notes due 2033
439.8 — 
5,727.0 5,823.0 
Unamortized discount(10.8)(5.1)
Unamortized debt issuance costs(31.8)(27.0)
Unamortized deferred gain from settlement of interest rate swaps1.3 16.4 
$5,685.7 $5,807.3 
Maturities of Long-Term Debt At December 31, 2021, the maturities of our long-term debt were (in millions):
2022$— 
2023— 
2024750.0 
2025— 
20261,400.0 
Thereafter3,577.0 
$5,727.0 
Components of Interest Expense Interest expense is composed of (in millions):
Year Ended December 31,
202120202019
Long-term debt$167.3 $178.6 $185.7 
Early redemption payments and other fees43.4 14.1 14.1 
Pension and other interest35.3 38.0 53.2 
Interest rate swaps(9.6)(8.9)(8.7)
 $236.4 $221.8 $244.3