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Financial Instruments, Risk Management and Fair Value Measurements - Narrative (Details) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 20, 2019 USD ($) | Dec. 31, 2020 USD ($) MMBTU | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Estimated fair value of debt |  | $ 3,640.0 | $ 3,393.8 |  |
Carrying amount of debt |  | 3,267.8 | 3,258.8 |  |
Cumulative changes in net gain (loss) from cash flow hedges |  | 72.8 | 66.0 | $ (11.2) | $ (5.2)
Loss on settlement |  | (1.9) | 16.7 |  |
Cash Flow Hedging | Designated as Cash Flow Hedges |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cumulative changes in net gain (loss) from cash flow hedges |  | 0.7 |  |  |
Foreign currency contracts |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cumulative changes in net gain (loss) from cash flow hedges |  | 11.6 | 1.4 | (10.4) | (4.4)
Foreign currency contracts | Designated as Cash Flow Hedges |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Derivative, notional amount |  | 1,881.0 |  |  |
Foreign currency contracts | Not Designated as Hedging Instruments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Derivative, notional amount |  | 2,026.0 |  |  |
Foreign currency contracts | Cash Flow Hedging | Designated as Cash Flow Hedges |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cumulative changes in net gain (loss) from cash flow hedges |  | 18.3 |  |  |
Interest rate contracts |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cumulative changes in net gain (loss) from cash flow hedges |  | 61.2 | $ 64.6 | $ (0.8) | $ (0.8)
Interest rate contracts | Cash Flow Hedging | Designated as Cash Flow Hedges |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Derivative, notional amount |  | $ 100.0 |  |  |
Loss on settlement | $ 83.1 |  |  |  |
Energy contracts | Designated as Cash Flow Hedges |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Aggregate notional volume of outstanding natural gas (mmBTU) | MMBTU |  | 0 |  |  |
Foreign currency and energy contracts | Designated as Cash Flow Hedges |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss on derivative contracts |  | $ 18.3 |  |  |

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