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Commitments and Contingencies (Lease Commitments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating and Capital Leased Assets [Line Items] [Line Items]      
Expenses under real property, equipment, and sofware leases $ 52.8 $ 51.4 $ 49.0
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Noncancelable Lease Commitments, Operating, 2017 [1],[2] 45.6    
Noncancelable Lease Commitments, Operating, 2018 [1],[2] 42.7    
Noncancelable Lease Commitments, Operating, 2019 [1],[2] 39.2    
Noncancelable Lease Commitments, Operating, 2020 [1],[2] 37.8    
Noncancelable Lease Commitments, Operating, 2021 [1],[2] 31.2    
Noncancelable Lease Commitments, Operating, Thereafter [1],[2] 236.8    
Noncancelable Lease Commitments, Operating, Total minimum payments [1],[2] 433.3    
Other operating expenses excluded from future minimum lease obligations 24.0    
Minimum sublease income 1.1    
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Noncancelable Lease Commitments, Capital, 2017 [1] 20.0    
Noncancelable Lease Commitments, Capital, 2018 [1] 16.2    
Noncancelable Lease Commitments, Capital, 2019 [1] 32.4    
Noncancelable Lease Commitments, Capital, 2020 [1] 7.0    
Noncancelable Lease Commitments, Capital, 2021 [1] 6.7    
Noncancelable Lease Commitments, Capital, Thereafter [1] 82.5    
Noncancelable Lease Commitments, Capital, Total minimum payments [1] 164.8    
Noncancelable Lease Commitments, Capital, Amounts representing interest [1] (46.7)    
Noncancelable Lease Commitments, Capital, Total [1] $ 118.1    
Minimum [Member]      
Operating and Capital Leased Assets [Line Items] [Line Items]      
Operating leases, term of contract 1 year    
Maximum [Member]      
Operating and Capital Leased Assets [Line Items] [Line Items]      
Operating leases, term of contract 25 years    
[1] Amounts for capital and operating lease commitments do not include certain operating expenses such as maintenance, insurance, and real estate taxes. In 2016, these charges totaled approximately $24 million.
[2] Future minimum operating lease payments do not reflect future minimum sublease income of $1.1 million. Additionally, operating leases that are on a month-to-month basis are not included.