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Debt - Other (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 12, 2013 USD ($) | Nov. 20, 2006 USD ($) tranche | Sep. 30, 2016 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) item | Dec. 31, 2018 USD ($) | Nov. 15, 2016 USD ($)
Debt |  |  |  |  |  |  |
Total |  |  |  | $ 1,651.8 | $ 1,651.8 | $ 2,214.2 |
Number of financial covenants | item |  |  |  |  | 2 |  |
Credit Agreement |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 2,100.0 |  |  |  |
Debt term |  |  | 5 years |  |  |  |
Unsecured revolving credit facility due September 30, 2021 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 1,500.0 |  |  |  |
Total |  |  |  | $ 408.0 | $ 408.0 | $ 925.0 |
Additional maximum borrowing capacity under the credit agreement subject to approval of the lenders and certain other conditions |  |  | 500.0 |  |  |  |
Commitment fee on unused portion of revolving credit facility (as a percent) |  |  |  |  | 0.125% |  |
Weighted average fixed interest rate (as a percent) |  |  |  | 3.20% | 3.20% | 3.86% |
Letters of credit outstanding |  |  |  | $ 40.6 | $ 40.6 |  |
Available on the revolving credit facility |  |  |  | 1,050.0 | $ 1,050.0 |  |
Unsecured revolving credit facility due September 30, 2021 | LIBOR |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Variable interest rate |  |  |  |  | LIBOR |  |
Interest rate added to base (as a percent) |  |  |  |  | 1.00% |  |
Unsecured revolving credit facility due September 30, 2021 | Bank prime rate |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Variable interest rate |  |  |  |  | bank prime |  |
Unsecured term loan due from December 31, 2019 to September 30, 2021 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Total |  |  |  | $ 480.0 | $ 480.0 | $ 525.0 |
Debt amount |  |  | $ 600.0 |  |  |  |
Annual amortization of term loan thereafter until June 2021 (as a percent) |  |  | 10.00% |  |  |  |
Interest rate added to base rate adjustment (as a percent) |  |  |  | (0.25%) |  |  |
Weighted average fixed interest rate (as a percent) |  |  |  | 3.04% | 3.04% | 3.77% |
Unsecured term loan due from December 31, 2019 to September 30, 2021 | LIBOR |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Variable interest rate |  |  |  |  | LIBOR |  |
Interest rate added to base (as a percent) |  |  |  |  | 1.00% |  |
Unsecured term loan due from December 31, 2019 to September 30, 2021 | Bank prime rate |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Variable interest rate |  |  |  |  | bank prime |  |
Senior Unsecured Notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Percentage of principal amount at which the notes may be required to be repurchased in event of a change of control and a downgrade of the entity's credit rating |  |  |  |  | 101.00% |  |
Senior unsecured notes issued November 20, 2006 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Issuance of debt |  | $ 600.0 |  |  |  |  |
Number of tranches comprising the debt issuance | tranche |  | 2 |  |  |  |  |
Senior unsecured notes due November 15, 2016 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Total |  |  |  |  |  |  | $ 0.0
Interest rate (as a percent) |  | 6.20% |  |  |  |  |
Lump sum payment on maturity |  |  |  |  |  |  | $ 350.0
Issuance of debt |  | $ 350.0 |  |  |  |  |
Senior unsecured notes due April 15, 2023 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Total |  |  |  | $ 500.0 | $ 500.0 | $ 500.0 |
Interest rate (as a percent) | 4.50% |  |  |  |  |  |
Issuance of debt | $ 500.0 |  |  |  |  |  |
Senior unsecured notes due November 15, 2036 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Total |  |  |  | 250.0 | 250.0 | 250.0 |
Interest rate (as a percent) |  | 6.85% |  |  |  |  |
Issuance of debt |  | $ 250.0 |  |  |  |  |
Other notes and revolving credit facilities |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 9.8 | 9.8 |  |
Total |  |  |  | 4.6 | 4.6 | 4.7 |
IRB |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Total |  |  |  | $ 9.2 | $ 9.2 | $ 9.5 |

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