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Summary of Significant Accounting Policies Depreciation and Amortization (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cost of Goods Sold, Depreciation and Amortization $ 120.1 $ 109.6 $ 98.9
Depreciation, Depletion and Amortization, Nonproduction 3.2 3.2 3.0
Depreciation and amortization $ 123.3 $ 112.8 $ 101.9