Fair Value Measurements - Roll-Forward of Fair Value of Recurring Level 3 Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Contingent consideration liability	$ 4.2	$ 4.4	$ 4.2	$ 4.4
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Contingent consideration liability, beginning balance	4.2	4.3	4.2	4.3
Total losses included in earnings	0.0	0.1	0.0	0.1
Contingent consideration liability, ending balance	$ 4.2	$ 4.4	$ 4.2	$ 4.4