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Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair value assets and liabilities measured on recurring basis    
Cash equivalents $ 201.6 $ 440.8
Contingent acquisition obligations [1] 147.0 205.4
Contingent acquisition obligation, total change (58.4)  
Contingent acquisition obligation, payments (105.3)  
Contingent acquisition obligation, additions 40.8  
Level 1    
Fair value assets and liabilities measured on recurring basis    
Cash equivalents 201.6 440.8
Contingent acquisition obligations [1] 0.0 0.0
Level 2    
Fair value assets and liabilities measured on recurring basis    
Cash equivalents 0.0 0.0
Contingent acquisition obligations [1] 0.0 0.0
Level 3    
Fair value assets and liabilities measured on recurring basis    
Cash equivalents 0.0 0.0
Contingent acquisition obligations [1] $ 147.0 $ 205.4
[1] Contingent acquisition obligations includes deferred acquisition payments and unconditional obligations to purchase additional noncontrolling equity shares of consolidated subsidiaries. Fair value measurement of the obligations is based upon actual and projected operating performance targets as specified in the related agreements. The decrease in this balance of $58.4 from December 31, 2016 to December 31, 2017 is primarily due to payments of $105.3, partially offset by acquisitions and exercised put options of $40.8. The amounts payable within the next twelve months are classified in accrued liabilities; any amounts payable thereafter are classified in other non-current liabilities.