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Leasing - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Renewal term	29 years
Termination period	30 days
Operating lease commitments, 2019		$ 4.8
Operating lease commitments, 2020		4.0
Operating lease commitments, 2021		3.6
Operating lease commitments, 2022		3.4
Operating lease commitments, 2023		3.4
Operating lease commitments, thereafter		$ 13.0
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Operating lease renewal term		5 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	23 years
Operating lease renewal term		20 years

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Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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