Goodwill and Other Intangible Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Changes In The Carrying Amount Of Goodwill

The carrying amount of goodwill as of December 31, 2015 is detailed below by reporting unit (in millions):



	December 31, 2015								December 31, 2014
	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	$	(2,997.9	)	$	83.5		$	3,081.4	$	—		$	3,081.4
Loss on impairment	—		(83.5		)	(83.5		)	—		(2,997.9		)	(2,997.9		)
Balance, end of period	$	3,081.4	$	(3,081.4	)	$	—		$	3,081.4	$	(2,997.9	)	$	83.5

Jackups
Balance, beginning of period	$	192.6	$	—		$	192.6		$	192.6	$	—		$	192.6
Loss on impairment	—		(192.6		)	(192.6		)	—		—			—
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, 2015 and 2014 were as follows (in millions):



	December 31, 2015								December 31, 2014
	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	$	(163.3	)	$	45.7		$	209.0	$	(130.6	)	$	78.4
Amortization	—		(41.4		)	(41.4		)	—		(32.7		)	(32.7		)
Balance, end of period	$	209.0	$	(204.7	)	$	4.3		$	209.0	$	(163.3	)	$	45.7

Drilling contract intangible liabilities
Balance, beginning of period	$	278.0	$	(237.3	)	$	40.7		$	278.0	$	(208.9	)	$	69.1
Amortization	—		(28.1		)	(28.1		)	—		(28.4		)	(28.4		)
Balance, end of period	$	278.0	$	(265.4	)	$	12.6		$	278.0	$	(237.3	)	$	40.7

Schedule of Expected Amortization Income (Expense)

We amortize the drilling contract intangibles to operating revenues over the respective remaining drilling contract terms on a straight-line basis. The estimated net increase to future operating revenues related to the amortization of these intangible assets and liabilities as of December 31, 2015, is as follows (in millions):



2016	$	8.3
Total	$	8.3