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Financial Instruments - Balance Sheet (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Derivatives, Fair Value [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss) | $ (41.6) | $ 60.7 | $ (119.2) | $ 176.4 |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax | (26.2) |  | (26.2) |  | $ (56.5)
Gain (loss) expected to be reclassified in one year or less |  |  | (1.5) |  |
Foreign currency |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax | (2.0) |  | (2.0) |  | (2.3)
Gain (loss) expected to be reclassified in one year or less |  |  | (1.3) |  |
Commodity contracts |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax | (0.2) |  | (0.2) |  | 0.0
Gain (loss) expected to be reclassified in one year or less |  |  | (0.2) |  |
Designated as Hedging Instrument [Member] | Foreign currency | Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative assets | 1.2 |  | 1.2 |  | 0.9
Designated as Hedging Instrument [Member] | Foreign currency | Accounts Payable and Accrued Liabilities [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 2.4 |  | 2.4 |  | 3.9
Designated as Hedging Instrument [Member] | Foreign currency | Other Noncurrent Assets [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative assets | 0.0 |  | 0.0 |  | 0.8
Designated as Hedging Instrument [Member] | Foreign currency | Other Noncurrent Liabilities [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 0.7 |  | 0.7 |  | 0.0
Designated as Hedging Instrument [Member] | Commodity contracts | Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative assets | 0.0 |  | 0.0 |  | 0.0
Designated as Hedging Instrument [Member] | Commodity contracts | Accounts Payable and Accrued Liabilities [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 0.2 |  | 0.2 |  | 0.0
Designated as Hedging Instrument [Member] | Cross Currency Interest Rate Contract [Member] | Other Current Assets [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative assets | 0.7 |  | 0.7 |  | 0.0
Designated as Hedging Instrument [Member] | Cross Currency Interest Rate Contract [Member] | Other Noncurrent Assets [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative assets | 10.0 |  | 10.0 |  | 0.0
Designated as Hedging Instrument [Member] | Cross Currency Interest Rate Contract [Member] | Accounts payable and accrued expenses [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 0.3 |  | 0.3 |  | 0.0
Designated as Hedging Instrument [Member] | Cross Currency Interest Rate Contract [Member] | Other Noncurrent Liabilities [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 0.0 |  | 0.0 |  | 0.0
Not Designated as Hedging Instrument [Member] | Foreign currency | Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative assets | 0.1 |  | 0.1 |  | 0.0
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 | 0.2 |  | 0.2 |  | 1.1
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 | 3.1 |  | 3.1 |  | 2.9
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 | 10.0 |  | 10.0 |  | 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 | $ (37.1) |  | $ (37.1) |  | $ (57.1)

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