Amount of minimum lease payments for capital leases.

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Contractually required future rental payments receivable on noncancelable subleasing arrangements.

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The amount of revenue recognized for the period under subleasing arrangements.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Loss Contingency, Dismissal of Securities Class Action, Denial Of Defendants' Motion To Dismiss, Party No Longer Consenting To Stay, Term Needed To Notify Court

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Loss Contingency, Number Of Lawsuits

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Commitments And Contingencies (Narrative) (Details) $ in Millions				12 Months Ended
	Sep. 06, 2018 lawsuit	Aug. 07, 2018	Jun. 22, 2018 lawsuit	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 22, 2018 USD ($)
Gain Contingencies [Line Items]
Future minimum lease payments, sublease income				$ 8.3
Rent expense				7.7	$ 7.6	$ 7.1
Sublease income				1.9	$ 1.7	$ 0.7
Future minimum capital lease payments due				$ 0.4
Number of derivative lawsuits \| lawsuit	2		2
Term needed to notify court of dismissal of Securities Class Action, denial of defendants' motions to dismiss, party giving notice to vacate stay		15 days
OPM Claims Denial \| Positive Outcome of Litigation
Gain Contingencies [Line Items]
Unrecorded gain contingency							$ 6.2