Goodwill and Intangible Assets (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Increase in goodwill	$ 2,100,000
Goodwill impairment charges	0	$ 0	$ 0
Five Reporting Units
Goodwill [Line Items]
Goodwill	$ 532,700,000	530,600,000
Indefinite-lived Intangible Assets (Excluding Goodwill)		$ 1,000,000.0

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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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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