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Indebtedness (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Components of Indebtedness Long-term debt consisted of the following at December 31, 2020 and 2019 (in millions):
December 31, 2020December 31, 2019
Senior term loan due 2022(1)
$184.0 $168.1 
Credit facility, expires 2023(1)
277.9 — 
1.002% Senior term loan due 2025
306.7 280.2 
Senior term loans due between 2021 and 2028(1)
806.0 736.2 
Other long-term debt10.5 12.5 
Debt issuance costs(2.5)(2.3)
1,582.6 1,194.7 
Less: Senior term loans due 2021, net of debt issuance costs(323.6)— 
           Current portion of other long-term debt(2.3)(2.9)
Total long-term indebtedness, less current portion$1,256.7 $1,191.8 
Maturities of Long-term Debt At December 31, 2020, the aggregate scheduled maturities of long-term debt, excluding the current portion of long-term debt, are as follows (in millions):
2022$463.5 
2023304.3 
20242.5 
2025383.8 
Thereafter102.6 
$1,256.7