Employee Retirement Plans (Accumulated Benefit Obligations, Amounts Recognized on Balance Sheets, and Reconciliation of AOCI) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax
Amount arising during the period	$ 3,700,000	$ (95,200,000)	$ 133,600,000
Pension Benefits [Member]
Defined Benefit Plan, Amounts Recognized in Balance Sheet
Current liabilities	(1,800,000)	(1,200,000)
Noncurrent liabilities	(136,000,000)	(161,500,000)
Total amount recognized	(137,800,000)	(162,700,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax
Amortization of amounts in accumulated other comprehensive income expected to be recognized as components of net periodic pension income	0
Postretirement Benefits [Member]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax
Accumulated other comprehensive income (loss), before Tax, beginning balance	0	11,000,000
Amount arising during the period	0	0
Amortization included in net earnings (loss)		(6,100,000)
Plan curtailments included in net loss		(4,900,000)
Accumulated other comprehensive income (loss), before Tax, ending balance	0	0	11,000,000
Actuarial Gain (Loss), net [Member] | Pension Benefits [Member]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax
Accumulated other comprehensive income (loss), before Tax, beginning balance	(44,600,000)	50,600,000
Amount arising during the period	3,700,000	(95,200,000)
Amortization included in net earnings (loss)		0
Plan curtailments included in net loss		0
Accumulated other comprehensive income (loss), before Tax, ending balance	(40,900,000)	(44,600,000)	50,600,000
Actuarial Gain (Loss), net [Member] | Postretirement Benefits [Member]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax
Accumulated other comprehensive income (loss), before Tax, beginning balance	0	(11,600,000)
Amount arising during the period	0	0
Amortization included in net earnings (loss)		(300,000)
Plan curtailments included in net loss		11,900,000
Accumulated other comprehensive income (loss), before Tax, ending balance	0	0	(11,600,000)
Prior Service Credit (Cost) [Member] | Postretirement Benefits [Member]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax
Accumulated other comprehensive income (loss), before Tax, beginning balance	0	22,600,000
Amount arising during the period	0	0
Amortization included in net earnings (loss)		(5,800,000)
Plan curtailments included in net loss		(16,800,000)
Accumulated other comprehensive income (loss), before Tax, ending balance	0	0	22,600,000
Defined Benefit Plan, Termination [Member] | Pension Benefits [Member]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax
Curtailment/settlement gain	0	0	0
Defined Benefit Plan, Termination [Member] | Postretirement Benefits [Member]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax
Curtailment/settlement gain	0	4,900,000	0
Defined Benefit Plan, Termination [Member] | Actuarial Gain (Loss), net [Member] | Postretirement Benefits [Member]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax
Reduction of plan obligations		3,700,000
Defined Benefit Plan, Curtailments [Member] | Pension Benefits [Member]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax
Curtailment/settlement gain	0	0	2,100,000
Defined Benefit Plan, Curtailments [Member] | Postretirement Benefits [Member]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax
Curtailment/settlement gain	$ 0	0	0
Restructuring Charges [Member] | Defined Benefit Plan, Termination [Member] | Postretirement Benefits [Member]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax
Curtailment/settlement gain		$ 4,900,000
Restructuring Charges [Member] | Defined Benefit Plan, Curtailments [Member] | Pension Benefits [Member]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax
Curtailment/settlement gain			$ 2,100,000