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Fair Value of Financial Instruments (Fair Value of Financial Instruments, Recurring Basis Measurements) (Narrative) (Details) - Earn-Out Arrangements [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]      
Additions from new business combinations, ASC 805 contingent consideration $ 33.6 $ 32.5 $ 66.7
Payments of ASC 805 contingent consideration 48.4 8.5 3.8
Foreign Currency Translation Adjustments [Member]      
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]      
Foreign currency translation gains, other comprehensive income, ASC 805 contingent consideration 4.5 2.2 $ 0.1
Level 3 [Member] | Fair Value [Member]      
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]      
ASC 805 contingent consideration, fair value $ 146.1 $ 165.4  
Level 3 [Member] | Fair Value Measurements, Recurring [Member]      
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]      
Fair value measurements, valuation techniques The fair value of ASC 805 contingent consideration is based on management estimates and entity-specific assumptions, which are Level 3 inputs, and is evaluated on an ongoing basis.