Fair Value Of Assets And Liabilities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	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	$ 125.6	$ 402.3
Contingent consideration paid	(281.6)
Long-term debt (net of current maturities and loan origination fees of $0.6 at both September 30, 2016 and December 31, 2015)	312.7	171.9
Debt Instrument, Interest Rate, Stated Percentage			5.375%
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	4.9
Fair Value Inputs, Sensitivity Analysis, Hypothetical Discount Rate	1.2
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents and restricted cash	32.3	30.1
Deferred Payment-Founder, Fair Value	0.0	0.0
Contingent consideration liability	0.0	0.0
Business Combination, Contingent Consideration, Liability	0.0	0.0
Assets, Fair Value Disclosure	32.3	30.1
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	621.0	604.1
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	125.6	402.3
Deferred Payment-Founder, Change in Fair Value	1.3
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	3.6
Cash equivalents and restricted cash	0.0	0.0
Deferred Payment-Founder, Fair Value	56.1	54.8
Contingent consideration liability	2.3	2.3
Business Combination, Contingent Consideration, Liability	67.2	345.2
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 $0.6 at both September 30, 2016 and December 31, 2015)	$ 600.0	$ 600.0