Summary of Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019	Oct. 31, 2016
Property, Plant and Equipment [Line Items]
Reclassification of tax on undistributed earnings of foreign subsidiaries		$ 14,000,000
Rentals Revenue
Initial direct costs included in rental property and equipment	$ 17,000,000	10,000,000
Amortization of initial direct costs	5,000,000	5,000,000	$ 7,000,000
Costs to Obtain a Contract
Amortization expense	15,000,000
Unamortized contract costs	42,287,000	0
Deferred Marketing Costs
Deferred marketing costs	0	35,668,000
New Accounting Pronouncements
Cumulative effect of accounting changes	(12,207,000)
Retained earnings	5,416,777,000	5,229,584,000
Other assets
Costs to Obtain a Contract
Unamortized contract costs	29,000,000
Selling, general and administrative expense
Deferred Marketing Costs
Deferred costs expensed		$ 13,000,000	$ 15,000,000
ASU 2018-02
New Accounting Pronouncements
Reclassification from AOCI	116,000,000
Cumulative effect of accounting changes	$ 0
ASU 2016-16
New Accounting Pronouncements
Retained earnings					$ 3,000,000
Minimum | ASU 2016-02 | Subsequent Event
New Accounting Pronouncements
Right-of-use asset				$ 175,000,000
Lease liability				175,000,000
Maximum
Intangible assets
Finite-lived intangible assets, estimated useful lives	15 years
Maximum | ASU 2016-02 | Subsequent Event
New Accounting Pronouncements
Right-of-use asset				225,000,000
Lease liability				$ 225,000,000
Buildings
Fixed Assets
Estimated useful lives	50 years
Building improvements | Minimum
Fixed Assets
Estimated useful lives	10 years
Building improvements | Maximum
Fixed Assets
Estimated useful lives	20 years
Software development costs | Minimum
Fixed Assets
Estimated useful lives	3 years
Software development costs | Maximum
Fixed Assets
Estimated useful lives	10 years
Machinery and equipment | Minimum
Fixed Assets
Estimated useful lives	3 years
Machinery and equipment | Maximum
Fixed Assets
Estimated useful lives	12 years
Rental equipment | Minimum
Fixed Assets
Estimated useful lives	4 years
Rental equipment | Maximum
Fixed Assets
Estimated useful lives	6 years