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Fair Value Of Assets And Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 16, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Inputs, Discount Rate 2.70%      
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value $ 61.7   $ 95.7  
Contingent consideration paid (34.2) $ (281.6)    
Long-term debt (net of current maturities and loan origination fees of $0.5 at both March 31, 2017 and December 31, 2016) 358.0   312.8  
Debt Instrument, Interest Rate, Stated Percentage       5.375%
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0.2      
Fair Value, Inputs, Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents and restricted cash 25.0   34.1  
Deferred Payment-Founder, Fair Value 0.0   0.0  
Business Combination, Contingent Consideration, Liability 0.0   0.0  
Assets, Fair Value Disclosure 25.0   34.1  
Fair Value, Inputs, Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term Debt, Fair Value 622.5      
Fair Value, Inputs, Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 61.7   95.7  
Increase (Decrease) in Deferred Founder Payment Liability 0.0      
Deferred Payment-Founder, Change in Fair Value 0.2      
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 0.0      
Cash equivalents and restricted cash 0.0   0.0  
Deferred Payment-Founder, Fair Value 28.0   27.8  
Business Combination, Contingent Consideration, Liability 33.7   67.9  
Unsecured Debt [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term debt (net of current maturities and loan origination fees of $0.5 at both March 31, 2017 and December 31, 2016) $ 600.0   $ 600.0