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Business Segment and Geographic Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment									1
Amount	$ 338.0	$ 266.7	$ 242.5	$ 184.4	$ 221.0	$ 184.6	$ 170.6	$ 142.3	$ 1,031.6	$ 718.5	$ 573.3
% of Total									100.00%	100.00%	100.00%
United States
Segment Reporting Information [Line Items]
Amount									$ 818.4	$ 596.2	$ 497.5
% of Total									79.00%	83.00%	87.00%
Outside of the United States
Segment Reporting Information [Line Items]
Amount									$ 213.2	$ 122.3	$ 75.8
% of Total									21.00%	17.00%	13.00%
Distributor
Segment Reporting Information [Line Items]
Amount									$ 652.9	$ 538.0	$ 411.8
% of Total									63.00%	75.00%	72.00%
Direct
Segment Reporting Information [Line Items]
Amount									$ 378.7	$ 180.5	$ 161.5
% of Total									37.00%	25.00%	28.00%

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