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Financial Instruments and Risk Management - Narrative (Details)	3 Months Ended		12 Months Ended
	Dec. 31, 2018 USD ($) derivative_instrument	Dec. 31, 2017 USD ($)	Sep. 30, 2018 USD ($)	Apr. 01, 2019 USD ($)	Feb. 28, 2018 USD ($)	Mar. 31, 2017 USD ($)
Derivative [Line Items]
Unrecognized pre-tax loss	$ 2,900,000		$ (7,700,000)
Unrealized pre-tax gain	4,700,000		4,300,000
Portion or pre-tax gain included in AOCI expected to be included in earnings	4,700,000
Gain Recognized in Income	9,000,000	$ 0
Amount reclassified from liability based plan to equity compensation plan	100,000
Interest Rate Contracts
Derivative [Line Items]
Forward interest rate					2.47%
Notional value	400,000				$ 0
Line of Credit | Senior Secured Term Loan B Facility, net of discount, due 2022
Derivative [Line Items]
Face amount of debt	1,600.0
Estimate of Fair Value
Derivative [Line Items]
Fair market value of fixed rate long-term debt	0		0
Long-term debt held in escrow	0		0
Reported Value Measurement
Derivative [Line Items]
Fair market value of fixed rate long-term debt	600,000,000
Long-term debt held in escrow	1,245,200,000		$ 0
Senior Secured Term Loan B Facility due 2022 | Senior Secured Term Loan B Facility, net of discount, due 2022
Derivative [Line Items]
Face amount of debt	$ 400,000,000
Senior Secured Term Loan B Facility due 2022 | Senior Secured Term Loan B Facility, net of discount, due 2022 | Interest Rate Contracts
Derivative [Line Items]
Variable rate debt hedged						$ 0
Fixed interest rate						2.034%
Designated as Hedging Instrument | Cash Flow Hedging | Foreign Exchange Forward
Derivative [Line Items]
Number of open contracts | derivative_instrument	64,000,000
Notional value	$ 134,100,000.0
Not Designated as Hedging Instrument | Foreign Exchange Forward
Derivative [Line Items]
Number of open contracts | derivative_instrument	8
Notional value	$ 85,200,000.0
Scenario, Forecast | Interest Rate Contracts
Derivative [Line Items]
Notional value				$ 50,000,000

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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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

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