Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions			12 Months Ended
	Aug. 07, 2018	Feb. 09, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017	Nov. 17, 2016
Loss Contingencies [Line Items]
Deferred rent			$ 2.4	$ 2.1
Total rent expense			14.9	$ 14.8	$ 15.2
Exposure to earthquake loss	$ 68.3
Gain contingency, unrecorded amount			$ 31.6
California DOI [Member]
Loss Contingencies [Line Items]
Penalty interest assessed, statutory rate							7.00%
Litigation settlement expense		$ 27.6
Other liabilities [Member]
Loss Contingencies [Line Items]
Gain contingency, unrecorded amount						$ 30.9