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Fair Value Measurement (Narrative) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Fair Value Disclosures [Abstract]        
Liability $ 1,190.3 $ 1,058.0 $ 993.8 $ 475.9
Contingent consideration payable, current 67.4      
Contingent consideration payable, noncurrent 1,122.9      
Fair value | Recurring Basis        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Joint venture net written option $ 25.0