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Long-Term Debt (Tables)
6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
Long-term debt consisted of the following (in millions):
June 30,
2021
December 31,
2020
Senior Secured Credit Facility:
Borrowings under $250 million revolving credit facility, due 2024$— $— 
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(7.1)(7.4)
$1,033.7 $1,033.4