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Commitments and Contingencies Net Rent 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] |  |  |
Gross rent expense | $ 357.7us-gaap_LeaseAndRentalExpense | $ 366.1us-gaap_LeaseAndRentalExpense | $ 358.5us-gaap_LeaseAndRentalExpense
Third-party sublease rental income | (6.1)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 | (16.1)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 | (17.5)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1
Net rent expense | $ 351.6us-gaap_OperatingLeasesRentExpenseNet | $ 350.0us-gaap_OperatingLeasesRentExpenseNet | $ 341.0us-gaap_OperatingLeasesRentExpenseNet

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- Details
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Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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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Balance Type: | debit
Period Type: | duration

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- Definition The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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Balance Type: | credit
Period Type: | duration