Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Unrealized swap gain (loss), gross		$ (5.1)	$ (7.0)	$ 19.8	$ 8.7
Income tax effect		1.0	(2.9)	1.5	1.1
Unrealized swap gain (loss), net of tax effect	[1]	$ (6.1)	$ (4.1)	$ 18.3	$ 7.6

[1] The tax effect on our unrealized swap gain (loss) is reflected below: Unrealized swap gain (loss), gross$(5.1)$(7.0)$19.8 $8.7 Income tax effect1.0 (2.9)1.5 1.1 Unrealized swap gain (loss), net of tax effect(6.1)(4.1)18.3 7.6