Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Valuation and Qualifying Accounts [Roll Forward]
Balance at beginning of period		$ 28.0		$ 33.0		$ 28.8
Charges to cost and expense		24.6		2.2		7.8
Other additions		1.0		10.3		0.0
(Deductions)		(10.8)		(17.5)		(3.6)
Balance at end of period		42.8		28.0		33.0
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts [Roll Forward]
Balance at beginning of period		7.7		13.9		15.7
Charges to cost and expense	[1]	2.9		2.1		1.8
Other additions		0.0		0.0		0.0
(Deductions)	[2]	(2.2)		(8.3)		(3.6)
Balance at end of period		8.4		7.7		13.9
Costs and Earnings in Excess of Billings Allowance [Member]
Valuation and Qualifying Accounts [Roll Forward]
Balance at beginning of period		6.9		12.5		10.4
Charges to cost and expense	[1]	9.9		0.0		2.1
Other additions		0.0		0.0		0.0
(Deductions)	[2]	(7.3)		(5.6)		0.0
Balance at end of period		9.5		6.9		12.5
Inventory Valuation Reserve [Member]
Valuation and Qualifying Accounts [Roll Forward]
Balance at beginning of period		2.8		6.4		2.6
Charges to cost and expense	[3]	2.0		0.0		3.8
Other additions		0.0		0.0		0.0
(Deductions)	[4]	(1.3)		(3.6)		0.0
Balance at end of period		3.5		2.8		6.4
Valuation Allowance for Deferred Tax Assets [Member]
Valuation and Qualifying Accounts [Roll Forward]
Balance at beginning of period		10.6		0.2		0.1
Charges to cost and expense	[5]	9.8		0.1		0.1
Other additions		1.0	[6]	10.3	[6]	0.0
(Deductions)		0.0		0.0		0.0
Balance at end of period		$ 21.4		$ 10.6		$ 0.2

[1] Provisions for doubtful accounts and costs and earnings in excess of billings.

[2] Write-offs and reversals of uncollectible accounts receivable and non-billable costs and earnings in excess of billings.

[3] Provision for inventory obsolescence.

[4] Inventory write-offs.

[5] Increase in the foreign and state tax loss carryforwards.

[6] Additions related to unrealized gains and losses.