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Commitments And Contingencies (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) plaintiffs | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Oil and Gas Delivery Commitments and Contracts [Line Items] |  |  |  |  |  |  |  |  |  |  |
OPERATING REVENUES | $ 828.3 | $ 1,012.2 | $ 1,059.0 | $ 1,163.9 | $ 1,159.8 | $ 1,201.4 | $ 1,136.6 | $ 1,066.7 | $ 4,063.4 | $ 4,564.5 | $ 4,323.4
Provision for Doubtful Accounts |  |  |  |  |  |  |  |  | 24.1 | (5.0) | 11.7
Aggregate Contractual Capital Commitments Due In One Year | 169.6 |  |  |  |  |  |  |  | 169.6 |  |
Rental expenses |  |  |  |  |  |  |  |  | 50.9 | $ 54.4 | $ 49.1
2016 | 45.3 |  |  |  |  |  |  |  | 45.3 |  |
2017 | 18.3 |  |  |  |  |  |  |  | 18.3 |  |
2018 | 12.0 |  |  |  |  |  |  |  | 12.0 |  |
2019 | 10.6 |  |  |  |  |  |  |  | 10.6 |  |
2020 | 10.1 |  |  |  |  |  |  |  | 10.1 |  |
Thereafter | 53.4 |  |  |  |  |  |  |  | $ 53.4 |  |
Loss Contingency, Claims Settled, Number | plaintiffs |  |  |  |  |  |  |  |  | 58 |  |
Letters of Credit Outstanding, Amount | 70.0 |  |  |  |  |  |  |  | $ 70.0 |  |
Petrobras [Member] | ENSCO DS-5 [Member] |  |  |  |  |  |  |  |  |  |  |
Oil and Gas Delivery Commitments and Contracts [Line Items] |  |  |  |  |  |  |  |  |  |  |
OPERATING REVENUES | 44.7 |  |  |  |  |  |  |  |  |  |
Provision for Doubtful Accounts | $ 17.1 |  |  |  |  |  |  |  |  |  |

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