Immaterial Error Correction - Statement of Equity Adjustment (Details) - USD ($) $ in Millions	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total equity	$ 628.1	$ 643.9	$ 657.4	$ 651.3	$ 660.4	$ 656.9	$ 645.3	$ 641.5
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total equity				654.8	663.1	659.3	647.0	643.0
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total equity				(3.5)	(2.7)	(2.4)	(1.7)	(1.5)
Retained Earnings
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total equity	$ 535.9	$ 544.0	$ 550.6	549.3	562.0	555.5	549.7	543.7
Retained Earnings | As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total equity				552.8	564.7	557.9	551.4	545.2
Retained Earnings | Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total equity				$ (3.5)	$ (2.7)	$ (2.4)	$ (1.7)	$ (1.5)