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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Comprehensive Income [Abstract]    
Net income $ 55.3 $ 89.3
Interest rate swap:    
Realized gain (loss) (0.1) 0.1
Unrealized gain (loss) 0.1 (3.6)
Reclassifications:    
Realized (gain) loss reclassified to interest expense 0.1 (0.1)
Amortization of unrealized (gain) loss to interest expense 0.2 0.0
Total 0.3 (3.6)
Deferred income tax (benefit) expense 0.1 (0.9)
Other comprehensive income (loss) 0.2 (2.7)
Comprehensive income $ 55.5 $ 86.6