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Goodwill and Other Intangible Assets, Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Intangible Assets
Weighted average useful lives of acquired amortizable intangible assets	9 years
Gross Carrying Amount (definite-lived)	$ 662.5	$ 651.9
Accumulated Amortization	451.1	396.0
Net Carrying Amount, (definite-lived)	211.4	255.9
Indefinite-lived trade name intangible asset	186.1	186.1
Intangible assets, gross (excluding goodwill)	848.6	838.0
Net Carrying Amount, intangible assets	$ 397.5	442.0
Customer relationships
Intangible Assets
Weighted average useful lives of acquired amortizable intangible assets	9 years
Gross Carrying Amount (definite-lived)	$ 456.6	446.2
Accumulated Amortization	313.6	272.2
Net Carrying Amount, (definite-lived)	$ 143.0	174.0
Proprietary technology
Intangible Assets
Weighted average useful lives of acquired amortizable intangible assets	11 years
Gross Carrying Amount (definite-lived)	$ 156.2	156.0
Accumulated Amortization	88.1	74.4
Net Carrying Amount, (definite-lived)	$ 68.1	81.6
Backlog and other
Intangible Assets
Weighted average useful lives of acquired amortizable intangible assets	2 years
Gross Carrying Amount (definite-lived)	$ 49.7	49.7
Accumulated Amortization	49.4	49.4
Net Carrying Amount, (definite-lived)	$ 0.3	$ 0.3

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