Goodwill and Other Intangible Assets - Schedule of Changes in the Carrying Amount of Goodwill by Segment (Details) $ in Millions	6 Months Ended
Jun. 30, 2018 USD ($)
Goodwill [Line Items]
Goodwill net book value, beginning balance	$ 447.4
Reclassified to assets held for sale	(9.3)
Foreign exchange and other adjustments	(0.7)
Goodwill net book value, ending balance	437.4
U.S.
Goodwill [Line Items]
Goodwill net book value, beginning balance	429.2
Reclassified to assets held for sale	(3.5)
Foreign exchange and other adjustments	0.0
Goodwill net book value, ending balance	425.7
International
Goodwill [Line Items]
Goodwill net book value, beginning balance	18.2
Reclassified to assets held for sale	(5.8)
Foreign exchange and other adjustments	(0.7)
Goodwill net book value, ending balance	$ 11.7

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.

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