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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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