Unusual Items - Narrative (Details) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Nov. 30, 2015	Nov. 30, 2014	Jul. 18, 2016
Unusual or Infrequent Item [Line Items]
Loss on extinguishment of debt	$ 0	$ 34,400,000	$ 1,900,000	$ 60,600,000
Proceeds from issuance of debt	0	800,000,000	0	189,000,000
Legal settlement			(50,000,000)
Loss on debt repurchased	0	34,500,000	1,900,000	60,800,000
Loss on bank amendment	0	100,000	0	200,000
Realized losses (gains) and interest	400,000	100,000	(100,000)	900,000
Senior Credit Facility [Member]
Unusual or Infrequent Item [Line Items]
Loss on bank amendment				200,000
Delayed Draw Term Loan [Member]
Unusual or Infrequent Item [Line Items]
Repurchased principal amount		13,000,000
Loss on extinguishment of debt		300,000
Principal amount of loan retired			76,000,000
Loss on debt repurchased			1,900,000
Corporate
Unusual or Infrequent Item [Line Items]
Loss on bank amendment	0	100,000	0	200,000
Loss on debt repurchased	0	34,400,000	1,900,000	60,600,000
Aerospace and Defense
Unusual or Infrequent Item [Line Items]
Loss on legal matters and settlements	$ 400,000	$ 0	$ 50,000,000	$ 900,000
7.125% Second-Priority Senior Secured Notes [Member] | Senior Notes [Member]
Unusual or Infrequent Item [Line Items]
Repurchased principal amount					$ 460,000,000.0
Redemption price rate on principal amount		105.344%
Loss on extinguishment of debt		$ 34,100,000
Loss on extinguishment of debt, before write-off of unamortized deferred financing costs		24,600,000
Write-off of deferred financing costs		9,500,000
Term Loan [Member] | Senior Notes [Member]
Unusual or Infrequent Item [Line Items]
Proceeds from issuance of debt		$ 400,000,000