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Financial Instruments - Balance Sheet (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Derivatives, Fair Value [Line Items] |  |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax | $ 32.0 | $ (14.0)
Gain (loss) expected to be reclassified in one year or less | 0.0 |
Designated as Hedging Instrument [Member] | Foreign currency | Prepaid Expenses and Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 2.0 | 2.0
Designated as Hedging Instrument [Member] | Foreign currency | Accounts Payable and Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | 3.0 | 2.0
Not Designated as Hedging Instrument [Member] | Foreign currency | Prepaid Expenses and Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 0.0 | 1.0
Not Designated as Hedging Instrument [Member] | Foreign currency | Accounts Payable and Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | 0.0 | 0.0
Net investment hedge | Foreign currency |  |
Derivatives, Fair Value [Line Items] |  |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax | 6.0 | 4.0
Gain (loss) expected to be reclassified in one year or less | 0.0 |
Net investment hedge | Cross Currency Interest Rate Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax | 28.0 | 12.0
Gain (loss) expected to be reclassified in one year or less | 0.0 |
Net investment hedge | Foreign currency denominated debt designated as a net investment hedge [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax | (2.0) | (30.0)
Gain (loss) expected to be reclassified in one year or less | 0.0 |
Net investment hedge | Designated as Hedging Instrument [Member] | Accounts Payable and Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | 0.0 | 0.0
Net investment hedge | Designated as Hedging Instrument [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 26.0 | 0.0
Net investment hedge | Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 2.0 | 12.0
Net investment hedge | Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | $ 0.0 | $ 0.0

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