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Impairment, Restructuring and Other Exit Costs - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Restructuring [Line Items]
Severance	$ 6.6	$ 63.9
Fair value of other impaired assets		25.0
Restructuring Costs	8.0	240.0
Level 3 | Investments
Restructuring [Line Items]
Carrying value of investments		95.0
Customer relationships
Restructuring [Line Items]
Impairment loss on intangible assets	27.0	34.0
Customer relationships | Other assets | Rationalization of Resources, Investments, Real Estate and Overhead Across Various Geographies
Restructuring [Line Items]
Impairment loss on intangible assets	$ 31.0
Customer relationships | Level 3 | Measurement Input, Weighted Average Long-term Revenue Growth Rate
Restructuring [Line Items]
Measurement input	2.40%
Customer relationships | Level 3 | Measurement Input, Weighted Average Cost of Capital
Restructuring [Line Items]
Measurement input	12.00%
Customer relationships | Level 3 | Measurement Input, Customer Attrition Factor
Restructuring [Line Items]
Measurement input	10.00%
Customer relationships | Minimum | Level 3 | Measurement Input, Long-term Revenue Growth Rate
Restructuring [Line Items]
Measurement input	2.00%
Customer relationships | Maximum | Level 3 | Measurement Input, Long-term Revenue Growth Rate
Restructuring [Line Items]
Measurement input	5.50%
AMECO
Restructuring [Line Items]
Restructuring Costs	$ 8.0	$ 240.0

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