Other Current Liabilities - Other Current Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Current Liabilities
Deferred revenue	$ 96.3	$ 87.0
Accrued compensation	104.2	105.4
Accrued warranty	19.7	20.6	$ 18.7	$ 19.6
Contingent consideration	7.1	6.5
Income taxes payable	36.8	28.1
Other taxes payable	23.4	16.7
Derivative liabilities	4.2	2.4
Other accrued expenses	60.2	55.3
Other current liabilities	$ 351.9	$ 322.0