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Operating Leases (Rent Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Rent expense | $ 155.3 | $ 152.8 | $ 144.1
Leased Facilities and Equipment [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Rent expense | 109.5 | 110.1 | 105.9
Leased Vehicles [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Rent expense | $ 45.8 | $ 42.7 | $ 38.2

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=us-gaap_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |