Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 89.3	$ 5.3
Interest rate swap:
Realized gain (loss)	0.1	0.0
Unrealized gain (loss)	(3.6)	0.0
Reclassified to interest expense	(0.1)	0.0
Total	(3.6)	0.0
Deferred income tax (benefit) expense	(0.9)	0.0
Other comprehensive income (loss)	(2.7)	0.0
Comprehensive income (loss)	$ 86.6	$ 5.3