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Leases-Company as Lessor - Historical Cost and Accumulated Depreciation of Leases Property (Details) (Land and Building, Property Subject to Operating Lease, USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Land and Building | Property Subject to Operating Lease
   
Property Subject to or Available for Operating Lease [Line Items]    
Leased property - real estate $ 1,100.0 $ 844.3
Less accumulated depreciation (99.5) (130.8)
Property under operating leases - net $ 1,000.5 $ 713.5