Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Millions		3 Months Ended
	Dec. 31, 2019	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Accumulated Other Comprehensive Loss
Net change on derivatives designated as cash flow hedges, tax		$ 0.1	$ 0.0	$ 0.2	$ 0.4	$ 0.3	$ 1.5
Cumulative Effect, Period of Adoption, Adjustment
Cumulative effect of ASC 326 adoption, tax	$ 0.3