Financial Statements for Guarantors of the Senior Notes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Condensed Income Statements, Captions [Line Items]
Revenue	$ 1,626.7	$ 1,460.5
Cost of revenues	1,211.1	1,074.0
Selling, engineering, and administrative expenses	98.3	83.6
Gains/(losses) on disposition of property, plant, and equipment	15.8	88.4
Cost of revenues and operating costs	1,293.6	1,069.2
Operating profit (loss)	333.1	391.3
Other (income) expense	48.7	45.8
Equity in earnings of subsidiaries, net of taxes	0	0
Income (loss) before income taxes	284.4	345.5
Provision (benefit) for income taxes	95.4	112.5
Net income (loss)	189.0	233.0
Net income attributable to noncontrolling interest	8.8	6.6
Net income (loss) attributable to controlling interest	180.2	226.4
Other comprehensive income (loss)	0.5	3.3
Comprehensive income	189.5	236.3
Parent
Condensed Income Statements, Captions [Line Items]
Revenue	0	0
Cost of revenues	(0.8)	0.4
Selling, engineering, and administrative expenses	25.4	22.0
Gains/(losses) on disposition of property, plant, and equipment	0.2	(0.3)
Cost of revenues and operating costs	24.4	22.7
Operating profit (loss)	(24.4)	(22.7)
Other (income) expense	4.3	3.8
Equity in earnings of subsidiaries, net of taxes	196.8	252.4
Income (loss) before income taxes	168.1	225.9
Provision (benefit) for income taxes	(12.1)	(0.5)
Net income (loss)	180.2	226.4
Net income attributable to noncontrolling interest	0	0
Net income (loss) attributable to controlling interest	180.2	226.4
Other comprehensive income (loss)	1.2	0.6
Comprehensive income	181.4	227.0
Combined Guarantor Subsidiaries
Condensed Income Statements, Captions [Line Items]
Revenue	1,300.6	1,139.6
Cost of revenues	1,038.7	856.5
Selling, engineering, and administrative expenses	43.8	31.4
Gains/(losses) on disposition of property, plant, and equipment	(0.1)	34.3
Cost of revenues and operating costs	1,082.6	853.6
Operating profit (loss)	218.0	286.0
Other (income) expense	7.7	5.6
Equity in earnings of subsidiaries, net of taxes	68.3	68.1
Income (loss) before income taxes	278.6	348.5
Provision (benefit) for income taxes	96.9	106.2
Net income (loss)	181.7	242.3
Net income attributable to noncontrolling interest	0	0
Net income (loss) attributable to controlling interest	181.7	242.3
Other comprehensive income (loss)	(0.5)	0
Comprehensive income	181.2	242.3
Combined Non-Guarantor Subsidiaries
Condensed Income Statements, Captions [Line Items]
Revenue	559.6	506.8
Cost of revenues	410.5	400.8
Selling, engineering, and administrative expenses	29.1	30.2
Gains/(losses) on disposition of property, plant, and equipment	15.7	54.4
Cost of revenues and operating costs	423.9	376.6
Operating profit (loss)	135.7	130.2
Other (income) expense	36.7	36.4
Equity in earnings of subsidiaries, net of taxes	0	0
Income (loss) before income taxes	99.0	93.8
Provision (benefit) for income taxes	9.3	8.8
Net income (loss)	89.7	85.0
Net income attributable to noncontrolling interest	0	0
Net income (loss) attributable to controlling interest	89.7	85.0
Other comprehensive income (loss)	(0.2)	2.7
Comprehensive income	89.5	87.7
Eliminations
Condensed Income Statements, Captions [Line Items]
Revenue	(233.5)	(185.9)
Cost of revenues	(237.3)	(183.7)
Selling, engineering, and administrative expenses	0	0
Gains/(losses) on disposition of property, plant, and equipment	0	0
Cost of revenues and operating costs	(237.3)	(183.7)
Operating profit (loss)	3.8	(2.2)
Other (income) expense	0	0
Equity in earnings of subsidiaries, net of taxes	(265.1)	(320.5)
Income (loss) before income taxes	(261.3)	(322.7)
Provision (benefit) for income taxes	1.3	(2.0)
Net income (loss)	(262.6)	(320.7)
Net income attributable to noncontrolling interest	8.8	6.6
Net income (loss) attributable to controlling interest	(271.4)	(327.3)
Other comprehensive income (loss)	0	0
Comprehensive income	$ (262.6)	$ (320.7)