Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule II - Valuation and Qualifying Accounts [Roll Forward]
Balance at beginning of period	$ 86.7	$ 83.6	$ 42.8
Charges to cost and expense	61.7	42.8	50.2
Other additions	0.0	0.0	0.0
(Deductions)	(50.5)	(39.7)	(9.4)
Balance at end of period	97.9	86.7	83.6
Allowance for Doubtful Accounts [Member]
Schedule II - Valuation and Qualifying Accounts [Roll Forward]
Balance at beginning of period	16.3	8.2	8.4
Charges to cost and expense	1.7	8.6	2.6
Other additions	0.0	0.0	0.0
(Deductions)	(7.9)	(0.5)	(2.8)
Balance at end of period	10.1	16.3	8.2
Costs and Earnings in Excess of Billings Allowance [Member]
Schedule II - Valuation and Qualifying Accounts [Roll Forward]
Balance at beginning of period	22.0	27.2	9.5
Charges to cost and expense	49.7	33.0	22.3
Other additions	0.0	0.0	0.0
(Deductions)	(40.4)	(38.2)	(4.6)
Balance at end of period	31.3	22.0	27.2
Valuation Allowance for Inventory [Member]
Schedule II - Valuation and Qualifying Accounts [Roll Forward]
Balance at beginning of period	7.8	7.7	3.5
Charges to cost and expense	2.1	1.1	6.2
Other additions	0.0	0.0	0.0
(Deductions)	(2.2)	(1.0)	(2.0)
Balance at end of period	7.7	7.8	7.7
Valuation Allowance for Deferred Tax Assets [Member]
Schedule II - Valuation and Qualifying Accounts [Roll Forward]
Balance at beginning of period	40.6	40.5	21.4
Charges to cost and expense	8.2	0.1	19.1
Other additions	0.0	0.0	0.0
(Deductions)	0.0	0.0	0.0
Balance at end of period	$ 48.8	$ 40.6	$ 40.5