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Financial Instruments - Balance Sheet (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Derivatives, Fair Value [Line Items] |  |  |  |  |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax | $ (36.1) |  | $ (36.1) |  | $ (56.5)
Gain (loss) expected to be reclassified in one year or less |  |  | (2.7) |  |
Foreign currency |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax | (4.4) |  | (4.4) |  | (2.3)
Gain (loss) expected to be reclassified in one year or less |  |  | (2.6) |  |
Commodity contracts |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax | (0.1) |  | (0.1) |  | 0.0
Gain (loss) expected to be reclassified in one year or less |  |  | (0.1) |  |
Designated as Hedging Instrument [Member] | Foreign currency | Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative assets | 1.5 |  | 1.5 |  | 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 | 4.0 |  | 4.0 |  | 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 | 1.7 |  | 1.7 |  | 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 | 0.1 |  | 0.1 |  | 0.0
Designated as Hedging Instrument [Member] | Cross Currency Interest Rate Contract [Member] | Other Noncurrent Assets [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative assets | 6.6 |  | 6.6 |  | 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 | 0.0 |  | 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 | 0.0 |  | 0.0 |  | 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 | 0.5 |  | 0.5 |  | 1.1
Cash Flow Hedging [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | (0.4) | $ (1.4) | (5.9) | $ (0.9) |
Net investment hedge |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | 45.9 | $ (44.9) | 22.6 | $ (51.7) |
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 | 2.9 |  | 2.9 |  | 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 | 6.6 |  | 6.6 |  | 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 | $ (41.1) |  | $ (41.1) |  | $ (57.1)

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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