Financial Statements for Guarantors of the Senior Notes (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Income Statements, Captions [Line Items]
Revenues	$ 1,103.8	$ 1,111.7	$ 1,184.9	$ 1,187.9	$ 1,547.0	$ 1,542.2	$ 1,676.8	$ 1,626.7	$ 4,588.3	$ 6,392.7	$ 6,170.0
Cost of revenues	841.2	827.3	897.7	889.9	1,116.1	1,109.4	1,219.6	1,211.1	3,456.1	4,656.2	4,619.8
Selling, engineering, and administrative expenses	101.9	102.3	106.7	96.5	137.1	126.6	114.4	98.3	407.4	476.4	403.6
Gains on dispositions on property	2.9	1.5	11.1	1.9	64.2	58.7	40.1	15.8	17.4	178.8	104.4
Cost of revenues and operating costs									3,846.1	4,953.8	4,919.0
Operating Profit (Loss)	163.6	183.6	191.6	203.4	358.0	364.9	382.9	333.1	742.2	1,438.9	1,251.0
Other (income) expense									175.4	186.9	186.9
Equity in earnings of subsidiaries, net of taxes									0.0	0.0	0.0
Income before income taxes									566.8	1,252.0	1,064.1
Provision (benefit) for income taxes									202.1	426.0	354.8
Net income	74.2	89.6	98.8	102.1	204.0	212.2	220.8	189.0	364.7	826.0	709.3
Net income attributable to noncontrolling interest									21.1	29.5	31.1
Net income attributable to controlling interest	$ 67.6	$ 84.2	$ 94.6	$ 97.2	$ 200.0	$ 204.3	$ 212.0	$ 180.2	343.6	796.5	678.2
Other comprehensive income									5.0	(0.5)	(31.0)
Comprehensive income									369.7	825.5	678.3
Comprehensive income attributable to noncontrolling interest									24.2	32.5	34.1
Comprehensive income attributable to controlling interest									345.5	793.0	644.2
Reportable legal entities | Parent
Condensed Income Statements, Captions [Line Items]
Revenues									0.0	0.0	0.0
Cost of revenues									(1.3)	(2.0)	2.3
Selling, engineering, and administrative expenses									125.3	147.0	115.6
Gains on dispositions on property									(0.5)	2.0	(1.4)
Cost of revenues and operating costs									124.5	143.0	119.3
Operating Profit (Loss)									(124.5)	(143.0)	(119.3)
Other (income) expense									(128.8)	(118.7)	(60.3)
Equity in earnings of subsidiaries, net of taxes									387.5	920.0	741.7
Income before income taxes									391.8	895.7	682.7
Provision (benefit) for income taxes									48.2	99.2	4.5
Net income									343.6	796.5	678.2
Net income attributable to noncontrolling interest									0.0	0.0	0.0
Net income attributable to controlling interest									343.6	796.5	678.2
Other comprehensive income									0.6	(6.0)	(33.9)
Comprehensive income									344.2	790.5	644.3
Comprehensive income attributable to noncontrolling interest									0.0	0.0	0.0
Comprehensive income attributable to controlling interest									344.2	790.5	644.3
Reportable legal entities | Combined Guarantor Subsidiaries
Condensed Income Statements, Captions [Line Items]
Revenues									2,880.8	4,668.8	4,290.3
Cost of revenues									2,331.5	3,594.9	3,345.5
Selling, engineering, and administrative expenses									121.8	153.3	124.9
Gains on dispositions on property									11.1	86.0	41.3
Cost of revenues and operating costs									2,442.2	3,662.2	3,429.1
Operating Profit (Loss)									438.6	1,006.6	861.2
Other (income) expense									67.4	68.6	57.1
Equity in earnings of subsidiaries, net of taxes									91.8	217.4	191.8
Income before income taxes									463.0	1,155.4	995.9
Provision (benefit) for income taxes									154.3	353.2	297.2
Net income									308.7	802.2	698.7
Net income attributable to noncontrolling interest									0.0	0.0	0.0
Net income attributable to controlling interest									308.7	802.2	698.7
Other comprehensive income									(0.4)	0.0	(8.5)
Comprehensive income									308.3	802.2	690.2
Comprehensive income attributable to noncontrolling interest									0.0	0.0	0.0
Comprehensive income attributable to controlling interest									308.3	802.2	690.2
Reportable legal entities | Combined Non-Guarantor Subsidiaries
Condensed Income Statements, Captions [Line Items]
Revenues									2,475.3	2,642.6	2,700.2
Cost of revenues									1,921.7	2,005.3	2,098.5
Selling, engineering, and administrative expenses									160.3	176.1	163.1
Gains on dispositions on property									6.8	90.8	64.5
Cost of revenues and operating costs									2,075.2	2,090.6	2,197.1
Operating Profit (Loss)									400.1	552.0	503.1
Other (income) expense									236.8	237.0	190.1
Equity in earnings of subsidiaries, net of taxes									0.0	0.0	0.0
Income before income taxes									163.3	315.0	313.0
Provision (benefit) for income taxes									56.8	12.5	50.6
Net income									106.5	302.5	262.4
Net income attributable to noncontrolling interest									0.0	0.0	0.0
Net income attributable to controlling interest									106.5	302.5	262.4
Other comprehensive income									4.8	5.5	11.4
Comprehensive income									111.3	308.0	273.8
Comprehensive income attributable to noncontrolling interest									0.0	0.0	0.0
Comprehensive income attributable to controlling interest									111.3	308.0	273.8
Eliminations
Condensed Income Statements, Captions [Line Items]
Revenues									(767.8)	(918.7)	(820.5)
Cost of revenues									(795.8)	(942.0)	(826.5)
Selling, engineering, and administrative expenses									0.0	0.0	0.0
Gains on dispositions on property									0.0	0.0	0.0
Cost of revenues and operating costs									(795.8)	(942.0)	(826.5)
Operating Profit (Loss)									28.0	23.3	6.0
Other (income) expense									0.0	0.0	0.0
Equity in earnings of subsidiaries, net of taxes									(479.3)	(1,137.4)	(933.5)
Income before income taxes									(451.3)	(1,114.1)	(927.5)
Provision (benefit) for income taxes									(57.2)	(38.9)	2.5
Net income									(394.1)	(1,075.2)	(930.0)
Net income attributable to noncontrolling interest									21.1	29.5	31.1
Net income attributable to controlling interest									(415.2)	(1,104.7)	(961.1)
Other comprehensive income									0.0	0.0	0.0
Comprehensive income									(394.1)	(1,075.2)	(930.0)
Comprehensive income attributable to noncontrolling interest									24.2	32.5	34.1
Comprehensive income attributable to controlling interest									$ (418.3)	$ (1,107.7)	$ (964.1)