Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary Of Non-Vested Share Award Related Compensation Expense Recognized

The following table summarizes share award and cash-settled award compensation expense recognized during each of the years in the three-year period ended December 31, 2018 (in millions):



	2018			2017			2016
Contract drilling	$	18.9		$	18.3		$	19.9
General and administrative	14.5			14.5			16.6
	33.4			32.8			36.5
Tax benefit	(2.8		)	(4.8		)	(5.9		)
Total	$	30.6		$	28.0		$	30.6

Summary Of Value Of Non-Vested Share Awards Granted And Vested

The following table summarizes the value of share awards and cash-settled awards granted and vested during each of the years in the three-year period ended December 31, 2018:



	Share Awards						Cash-Settled Awards
	2018		2017		2016		2018		2017		2016
Weighted-average grant-date fair value of share awards granted (per share)	$	6.16	$	7.90	$	10.42	$	5.31	$	6.27	$	9.64
Total fair value of share awards vested during the period (in millions)	$	7.5	$	8.6	$	8.8	$	9.9	$	3.9	$	—

Summary Of Non-Vested Share Award Activity

The following table summarizes share awards and cash-settled awards activity for the year ended December 31, 2018 (shares in thousands):



	Share Awards				Cash-settled Awards
	Awards		Weighted-Average Grant-Date Fair Value		Awards		Weighted-Average Grant-Date Fair Value
Share awards and cash-settled awards as of December 31, 2017	3,305		$	16.06	7,089		$	7.37
Granted	6,298		6.16		114		5.31
Vested	(1,312	)	19.85		(1,512	)	7.53
Forfeited	(225	)	11.62		(574	)	7.18
Share awards and cash-settled awards as of December 31, 2018	8,066		$	7.84	5,117		$	7.30