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Debt - Summary of Debt (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 13, 2017 | Sep. 05, 2014 | Oct. 22, 2013 | Jun. 26, 2012
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 2,496.3 | $ 2,645.7 |  |  |  |
Less current portion | 0.0 | 150.0 |  |  |  |
Less unamortized debt issuance costs | 12.6 | 15.3 |  |  |  |
Long-term debt | $ 2,483.7 | $ 2,480.4 |  |  |  |
Weighted-average interest rate | 3.64% | 3.80% |  |  |  |
Revolving Credit Facility, due August 2021 | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 0.0 | $ 0.0 |  |  |  |
Stated interest rate | 0.00% | 0.00% |  |  |  |
6.50% Senior Notes due March 2018 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  | $ 150.0 |  |  |  |
Stated interest rate | 6.50% | 6.50% |  |  |  |
2.45% Senior Notes, due December 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  | 2.45% |  |  |  |
2.45% Senior Notes, due December 2020 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 499.6 | $ 499.5 |  |  |  |
Stated interest rate | 2.45% | 2.45% | 2.45% |  |  |
3.90% Senior Notes, due June 2022 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 399.9 | $ 399.8 |  |  |  |
Stated interest rate | 3.90% | 3.90% |  |  |  | 3.90%
4.50% Senior Notes, due November 2023 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 699.0 | $ 698.8 |  |  |  |
Stated interest rate | 4.50% | 4.50% |  |  | 4.50% |
3.65% Senior Notes, due September 2024 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 399.3 | $ 399.2 |  |  |  |
Stated interest rate | 3.65% | 3.65% |  | 3.65% |  |
3.40% Senior Notes, due December 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  | 3.40% |  |  |  |
3.40% Senior Notes, due December 2027 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 498.5 | $ 498.4 |  |  |  |
Stated interest rate | 3.40% | 3.40% | 3.40% |  |  |
Current Portion of Long-term Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted-average interest rate | 0.00% | 6.50% |  |  |  |
Long-term Debt, Excluding Current Portion |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted-average interest rate | 3.64% | 3.64% |  |  |  |

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