Goodwill and Other Intangible Assets - Schedule of Changes in the Carrying Amount of Goodwill by Segment (Details) $ in Millions	9 Months Ended
Sep. 30, 2019 USD ($)
Goodwill [Line Items]
Goodwill net book value, beginning balance	$ 450.0
Purchase accounting adjustments	0.1
Foreign exchange and other adjustments	0.1
Goodwill net book value, ending balance	450.2
U.S.
Goodwill [Line Items]
Goodwill net book value, beginning balance	438.5
Purchase accounting adjustments	0.1
Foreign exchange and other adjustments	0.0
Goodwill net book value, ending balance	438.6
International
Goodwill [Line Items]
Goodwill net book value, beginning balance	11.5
Purchase accounting adjustments	0.0
Foreign exchange and other adjustments	0.1
Goodwill net book value, ending balance	$ 11.6

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
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