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Notes Payable and Long-Term Debt (Details) € in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€) | Jul. 26, 2017 USD ($) | Jun. 29, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jul. 20, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 3.10% | 3.10% |  |  |  | 2.30% |
Debt, Weighted Average Interest Rate |  |  |  |  |  | 3.80% |
Long-term Debt, by Current and Noncurrent [Abstract] |  |  |  |  |  |  |
Total long-term debt | $ 2,119,500,000 |  |  |  |  | $ 2,063,000,000 |
Current portion of long-term debt | 15,800,000 |  |  |  |  | 19,400,000 |
Long-term debt, net of current portion | 2,103,700,000 |  |  |  |  | 2,043,600,000 |
Long-term Debt, by Maturity [Abstract] |  |  |  |  |  |  |
2018 | 84,600,000 |  |  |  |  |  |
2019 | 138,700,000 |  |  |  |  |  |
2020 | 252,700,000 |  |  |  |  |  |
2021 | 2,700,000 |  |  |  |  |  |
2022 | 600,400,000 |  |  |  |  |  |
After 2022 | 1,121,000,000 |  |  |  |  |  |
Total payments | 2,200,100,000 |  |  |  |  |  |
Less: unamortized discounts | 11,800,000 |  |  |  |  |  |
Total | 2,188,300,000 |  |  |  |  |  |
Multi-currency revolving credit agreement, maximum borrowing capacity | 1,500,000,000 |  |  |  | $ 1,250,000,000 |  |
Estimated fair value of senior unsecured notes | 2,209,100,000 |  |  |  |  | 2,081,400,000 |
Fair value higher than carrying value for senior unsecured notes | 116,100,000 |  |  |  |  | 62,000,000 |
Outstanding letters of credit | 31,400,000 |  |  |  |  | 32,300,000 |
Short Term Borrowings [Member] |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  |  |
Total short-term debt | 68,800,000 |  |  |  |  | 156,500,000 |
Senior Notes Due November 2016 |  |  |  |  |  |  |
Long-term Debt, by Current and Noncurrent [Abstract] |  |  |  |  |  |  |
Debt instrument par value | $ 150,000,000 |  |  |  |  |  |
Debt instrument stated interest rate | 5.75% | 5.75% |  |  |  |  |
Debt instrument maturity period | Nov. 01, 2016 |  |  |  |  |  |
Senior Notes Due October 2019 |  |  |  |  |  |  |
Long-term Debt, by Current and Noncurrent [Abstract] |  |  |  |  |  |  |
Total long-term debt | $ 137,400,000 |  |  |  |  | 139,100,000 |
Debt instrument par value | $ 134,000,000 |  |  |  |  |  |
Debt instrument stated interest rate | 8.00% | 8.00% |  |  |  |  |
Debt instrument maturity period | Oct. 01, 2019 |  |  |  |  |  |
Senior Notes Due September 2020 |  |  |  |  |  |  |
Long-term Debt, by Current and Noncurrent [Abstract] |  |  |  |  |  |  |
Total long-term debt | $ 251,400,000 |  |  |  |  | 251,900,000 |
Debt instrument par value | $ 250,000,000 |  |  |  |  |  |
Debt instrument stated interest rate | 4.625% | 4.625% |  |  |  |  |
Debt instrument maturity period | Sep. 15, 2020 |  |  |  |  |  |
Senior Notes Due November 2022 |  |  |  |  |  |  |
Long-term Debt, by Current and Noncurrent [Abstract] |  |  |  |  |  |  |
Total long-term debt | $ 595,700,000 |  |  |  |  | 520,700,000 |
Debt instrument par value | € |  | € 500 |  |  |  |  |
Debt instrument stated interest rate | 1.80% | 1.80% |  |  |  |  |
Debt instrument maturity period | Nov. 07, 2022 |  |  |  |  |  |
Senior Notes Due March 2025 |  |  |  |  |  |  |
Long-term Debt, by Current and Noncurrent [Abstract] |  |  |  |  |  |  |
Total long-term debt | $ 496,100,000 |  |  |  |  | 495,600,000 |
Debt instrument par value | $ 500,000,000 |  |  |  |  |  |
Debt instrument stated interest rate | 3.375% | 3.375% |  |  |  |  |
Debt instrument maturity period | Mar. 15, 2025 |  |  |  |  |  |
Senior Notes Due February 2029 |  |  |  |  |  |  |
Long-term Debt, by Current and Noncurrent [Abstract] |  |  |  |  |  |  |
Total long-term debt | $ 118,900,000 |  |  |  |  | 118,800,000 |
Debt instrument par value | $ 121,000,000 |  |  |  |  |  |
Debt instrument stated interest rate | 7.125% | 7.125% |  |  |  |  |
Debt instrument maturity period | Feb. 15, 2029 |  |  |  |  |  |
Senior Notes Due March 2045 |  |  |  |  |  |  |
Long-term Debt, by Current and Noncurrent [Abstract] |  |  |  |  |  |  |
Total long-term debt | $ 493,500,000 |  |  |  |  | 493,300,000 |
Debt instrument par value | $ 500,000,000 |  |  |  |  |  |
Debt instrument stated interest rate | 4.375% | 4.375% |  |  |  |  |
Debt instrument maturity period | Mar. 15, 2045 |  |  |  |  |  |
Multi Currency Revolving Credit Facility [Member] |  |  |  |  |  |  |
Long-term Debt, by Maturity [Abstract] |  |  |  |  |  |  |
Multi-currency revolving credit agreement, maximum borrowing capacity |  |  |  | $ 1,000,000,000 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Long-term Debt, by Maturity [Abstract] |  |  |  |  |  |  |
Multi-currency revolving credit agreement, current borrowing capacity | $ 1,200,000,000 |  |  |  |  |  |
Commercial Paper [Member] |  |  |  |  |  |  |
Long-term Debt, by Current and Noncurrent [Abstract] |  |  |  |  |  |  |
Total long-term debt |  |  |  |  |  | 50,800,000 |
Long-term Debt, by Maturity [Abstract] |  |  |  |  |  |  |
Multi-currency revolving credit agreement, current borrowing capacity | 1,200,000,000.0 |  | $ 1,000,000,000.0 |  |  |  |
Term Loan Facilities And Other [Member] |  |  |  |  |  |  |
Long-term Debt, by Current and Noncurrent [Abstract] |  |  |  |  |  |  |
Total long-term debt | 26,500,000 |  |  |  |  | 43,600,000 |
Interest Rate Swap [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  | $ 384,000,000
Interest Rate Swap [Member] | Senior Notes Four [Member] |  |  |  |  |  |  |
Long-term Debt, by Maturity [Abstract] |  |  |  |  |  |  |
Derivative liabilities |  |  |  |  |  | 3,900,000 |
Interest Rate Swap [Member] | Senior Notes Three [Member] |  |  |  |  |  |  |
Long-term Debt, by Maturity [Abstract] |  |  |  |  |  |  |
Derivative liabilities |  |  |  |  |  | 1,300,000 |
Unamortized portion of debt derivative [Member] | Senior Notes Four [Member] |  |  |  |  |  |  |
Long-term Debt, by Maturity [Abstract] |  |  |  |  |  |  |
Derivative assets | 2,900,000 |  |  |  |  |  |
Unamortized portion of debt derivative [Member] | Senior Notes Three [Member] |  |  |  |  |  |  |
Long-term Debt, by Current and Noncurrent [Abstract] |  |  |  |  |  |  |
Total long-term debt | 2,700,000 |  |  |  |  | $ 4,100,000 |
Long-term Debt, by Maturity [Abstract] |  |  |  |  |  |  |
Derivative assets | $ 800,000 |  |  |  |  |  |

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