Summary of Significant Accounting Policies (Property, Plant and Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Land and land improvements	$ 11.9	$ 11.6
Buildings	82.3	73.9
Machinery and equipment	392.6	348.6
Leased property under capital leases	35.8	24.1
Total property, plant and equipment	522.6	458.2
Less: Accumulated depreciation	303.2	281.2
Property, plant and equipment, net	$ 219.4	$ 177.0

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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