Commitments and Contingencies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Business Acquisition, Contingent Consideration
Contingent consideration	$ 51.5		$ 45.1
Purchase obligation	107.5
Accrued Liabilities
Business Acquisition, Contingent Consideration
Contingent consideration	5.1		0.3
Other Noncurrent Liabilities
Business Acquisition, Contingent Consideration
Contingent consideration	46.4		$ 44.8
BioReference
Business Acquisition, Contingent Consideration
Severance costs	$ 3.3	$ 17.2