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Long-Term Debt (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
At December 31, 2020 and 2019, long-term debt consisted of the following (in millions):
20202019
Senior Secured Credit Facility:
$250 million revolving credit facility, due 2024$— $— 
Term B loan facility, due 2025490.8 490.8 
Unsecured Senior Notes, due 2028550.0 550.0 
1,040.8 1,040.8 
Unamortized deferred loan costs(7.4)(8.5)
Total long-term debt$1,033.4 $1,032.3