Impairment, Restructuring and Other Exit Costs - Narrative (Details) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) shares	Mar. 31, 2019 USD ($) shares
Restructuring [Line Items]
Severance	$ 70.0
Asset impairments	90.4
Entity liquidation costs (including the recognition of cumulative translation adjustments)	85.0
Other exit costs	5.0
Severance	$ 63.9	$ 27.0
Anti-dilutive securities not included above (in shares) | shares	5,545	4,776
Technology-Based Intangible Assets
Restructuring [Line Items]
Impairment of information technology assets	$ 16.0
Diversified Services
Restructuring [Line Items]
Impairment loss	169.0
Impairment of intangible assets	27.0
Energy & Chemicals
Restructuring [Line Items]
Other than temporary impairment for equity method investments	$ 86.0
Employee stock options, restricted stock units and shares, and Value Driver Incentive units
Restructuring [Line Items]
Anti-dilutive securities not included above (in shares) | shares	438	740
Level 3 | Weighted Average Long-term Revenue Growth Rate | Customer Relationships
Restructuring [Line Items]
Intangible assets, measurement input	0.024
Level 3 | Weighted Average Cost of Capital | Customer Relationships
Restructuring [Line Items]
Intangible assets, measurement input	0.12
Level 3 | Customer Attrition Factor | Customer Relationships
Restructuring [Line Items]
Intangible assets, measurement input	0.10
Level 3 | Minimum | Long-term Revenue Growth Rate | Customer Relationships
Restructuring [Line Items]
Intangible assets, measurement input	0.02
Level 3 | Maximum | Long-term Revenue Growth Rate | Customer Relationships
Restructuring [Line Items]
Intangible assets, measurement input	0.055