Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Accumulated goodwill impairment losses	$ 8.3		$ 8.3		$ 8.3
Goodwill impairment loss			0.0	$ 0.0
Aggregate amortization expense	14.4	$ 15.5	44.2	45.2
Impairment of intangible assets	$ 18.1	$ 2.7	$ 20.5	$ 3.3