Pension and Savings Plans (Details 2) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amounts recognized in the consolidated balance sheets:
Liabilities Subject to Compromise		$ (8,440.2)	$ 0.0
Pension Plan [Member]
Change in benefit obligation:
Projected benefit obligation at beginning of period		939.3	1,002.5
Service cost		2.5	2.7	$ 2.1
Interest cost		41.5	40.4	45.4
Benefits paid		61.1	62.6
Actuarial (gain) loss	[1]	37.1	(43.7)
Projected benefit obligation at end of period		959.3	939.3	1,002.5
Fair value of plan assets at beginning of period		757.3	839.8
Actual (loss) return on plan assets		75.7	(26.1)
Employer contributions		1.1	6.2
Benefits paid		(61.1)	(62.6)
Fair value of plan assets at end of period		773.0	757.3	$ 839.8
Funded status at end of year		(186.3)	(182.0)
Amounts recognized in the consolidated balance sheets:
Current obligation (included in Accounts payable and accrued expenses)		0.0	(1.6)
Noncurrent obligation (included in Other noncurrent liabilities)		(163.5)	(180.4)
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Other		(22.8)
Net amount recognized		$ (186.3)	$ (182.0)

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