Consolidated and Combined Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 31.8	$ 22.6	$ 59.5	$ 44.8
Derivative financial instruments:
Unrealized losses arising during the period, net of tax expense (benefit) of ($0.5), $0.0, ($0.7), and $0.0	(1.8)	0.0	(2.8)	0.0
Reclassification adjustments for losses included in net income, net of tax expense (benefit) of $0.0, $0.0, $0.0,and $0.0	0.0	0.0	0.1	0.0
Currency translation adjustment:
Unrealized gains (losses) arising during the period, net of tax expense (benefit) of $0.2, $0.0, $0.0, and $0.0	0.1	0.2	0.4	0.5
Other comprehensive income (loss)	(1.7)	0.2	(2.3)	0.5
Comprehensive income	$ 30.1	$ 22.8	$ 57.2	$ 45.3