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Goodwill and Other Intangible Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes In The Carrying Amount Of Goodwill | The carrying amount of goodwill as of December 31, 2014 is detailed below by reporting unit (in millions):
| December 31, 2014 |  | December 31, 2013
| Gross Carrying Amount |  | Accumulated Impairment Losses |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Impairment Losses |  | Net Carrying Amount
Floaters |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | $ | 3,081.4 |  |  | $ | — |  |  | $ | 3,081.4 |  |  | $ | 3,081.4 |  |  | $ | — |  |  | $ | 3,081.4 |
Loss on impairment | — |  |  | (2,997.9 | ) |  | (2,997.9 | ) |  | — |  |  | — |  |  | — |
Balance, end of period | $ | 3,081.4 |  |  | $ | (2,997.9 | ) |  | $ | 83.5 |  |  | $ | 3,081.4 |  |  | $ | — |  |  | $ | 3,081.4 |
Jackups |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | $ | 192.6 |  |  | $ | — |  |  | $ | 192.6 |  |  | $ | 192.6 |  |  | $ | — |  |  | $ | 192.6 |
Loss on impairment | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Balance, end of period | $ | 192.6 |  |  | $ | — |  |  | $ | 192.6 |  |  | $ | 192.6 |  |  | $ | — |  |  | $ | 192.6 |
Schedule of Other Intangible Assets and Liabilities | The gross carrying amounts of our drilling contract intangibles, which we consider to be definite-lived intangibles assets and intangible liabilities, and accumulated amortization as of December 31, 2014 and 2013 were as follows (in millions):
| December 31, 2014 |  | December 31, 2013
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Drilling contract intangible assets |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | $ | 209.0 |  |  | $ | (130.6 | ) |  | $ | 78.4 |  |  | $ | 209.0 |  |  | $ | (88.3 | ) |  | $ | 120.7 |
Amortization | — |  |  | (32.7 | ) |  | (32.7 | ) |  | — |  |  | (42.3 | ) |  | (42.3 | )
Balance, end of period | $ | 209.0 |  |  | $ | (163.3 | ) |  | $ | 45.7 |  |  | $ | 209.0 |  |  | $ | (130.6 | ) |  | $ | 78.4 |
Drilling contract intangible liabilities |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | $ | 278.0 |  |  | $ | (208.9 | ) |  | $ | 69.1 |  |  | $ | 278.0 |  |  | $ | (160.0 | ) |  | $ | 118.0 |
Amortization | — |  |  | (28.4 | ) |  | (28.4 | ) |  | — |  |  | (48.9 | ) |  | (48.9 | )
Balance, end of period | $ | 278.0 |  |  | $ | (237.3 | ) |  | $ | 40.7 |  |  | $ | 278.0 |  |  | $ | (208.9 | ) |  | $ | 69.1 |
Schedule of Expected Amortization Income (Expense) | The estimated net (reduction) increase to future operating revenues related to the amortization of these intangible assets and liabilities as of December 31, 2014, is as follows (in millions):
2015 |  | $ | (4.5 | )
2016 |  | (.8 | )
2017 |  | .3 |
Total |  | $ | (5.0 | )

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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