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Restructuring Charges - Severance and Other Restructuring Costs Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Structural Simplification Cost Savings Program
Restructuring Reserve [Roll Forward]
Liability at beginning of period			$ 41,392
Charges	$ 6,400	$ 47,800	15,156	$ 72,700
Payments/Utilization			(36,140)
Liability at end of period	20,408		20,408
Structural Simplification Cost Savings Program \| Severance
Restructuring Reserve [Roll Forward]
Liability at beginning of period			27,670
Charges			7,174
Payments/Utilization			(22,398)
Liability at end of period	12,446		12,446
Structural Simplification Cost Savings Program \| Other restructuring costs
Restructuring Reserve [Roll Forward]
Liability at beginning of period			13,722
Charges			7,982
Payments/Utilization			(13,742)
Liability at end of period	7,962		7,962
Capital Light Model
Restructuring Reserve [Roll Forward]
Liability at beginning of period			0
Charges	11,500		11,454
Payments/Utilization			(3,483)
Liability at end of period	7,971		7,971
Capital Light Model \| Severance
Restructuring Reserve [Roll Forward]
Liability at beginning of period			0
Charges			7,971
Payments/Utilization			0
Liability at end of period	7,971		7,971
Capital Light Model \| Other restructuring costs
Restructuring Reserve [Roll Forward]
Liability at beginning of period			0
Charges			3,483
Payments/Utilization			(3,483)
Liability at end of period	$ 0		$ 0