Consolidated Statements of Stockholders' Equity (Deficit) (unaudited) (Parenthetical) - USD ($) $ in Millions		3 Months Ended
	Dec. 31, 2019	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019
Accumulated Other Comprehensive Loss
Net change on derivatives designated as cash flow hedges, tax		$ 0.3	$ 1.5	$ 0.0	$ 0.1
Revision Of Prior Period, Accounting Standards Update, Adjustment
Impact of credit-loss standard adoption, tax	$ 0.3