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12. Commitments & Contingent Liabilities Period Expense (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract] |  |  |
Operating Leases, Rent Expense, Net | $ 46.9 us-gaap_OperatingLeasesRentExpenseNet | $ 45.5 us-gaap_OperatingLeasesRentExpenseNet | $ 41.4 us-gaap_OperatingLeasesRentExpenseNet
Contribution expense | $ 13.7 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution | $ 13.5 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution | $ 12.1 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution

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- Details
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Period Type: | duration

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- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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