Summary of Significant Accounting Policies Depreciation and Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Depreciation and amortization included in Cost of sales	$ 116.8	$ 120.1	$ 109.6
Depreciation and amortization included in Selling and administrative	3.2	3.2	3.2
Total depreciation and amortization	$ 120.0	$ 123.3	$ 112.8