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Long-Term Debt (Term Loan) (Details)		3 Months Ended
	Mar. 31, 2016 USD ($)	Sep. 30, 2016	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Term Loan [Member]
Debt Instrument [Line Items]
Face amount										$ 1,243,000,000
Medium-term Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant, Leverage Ratio, Certain Acquisitions Threshold	$ 50,000,000
Face amount	$ 2,035,000,000								$ 1,243,000,000
Medium-term Notes [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%	3.00%
Medium-term Notes [Member] | Maximum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%	2.00%
Medium-term Notes [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%	2.75%
Medium-term Notes [Member] | Minimum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%	1.75%
Scenario, Forecast [Member] | Medium-term Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant, Leverage Ratio			5.5	5.75	6.0	6.25	6.5	6.75
Debt Instrument, Covenant, Leverage Ratio, Certain Acquisitions			6.0

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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