Summary of Significant Accounting Policies Warranties (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Product Warranty Liability [Line Items]
Standard Product Warranty Accrual	$ 8.3	$ 10.5	$ 8.3	$ 10.5	$ 7.1	$ 7.4	$ 9.7	$ 10.1
Standard Product Warranty Accrual, Decrease for Payments	0.6	0.6	1.5	1.8
Warranty_originations_and_revisions	1.9	1.1	2.6	1.9
Standard Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties	$ (0.1)	$ 0.3	$ (0.2)	$ 0.3
Minimum
Product Warranty Liability [Line Items]
Product Warranty Period			1 year
Maximum
Product Warranty Liability [Line Items]
Finite-Lived Intangible Asset, Useful Life			5 years