Intangible Assets by Major Asset Class (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Year	Dec. 31, 2010
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (Years), Minimum	5
Useful life (Years), Maximum	34
Original Cost	$ 568.6	$ 544.9
Accumulated Amortization	178.8	154.4
Net Book Value	389.8	390.5
Customer contracts and relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (Years), Minimum	8
Useful life (Years), Maximum	30
Original Cost	314.7	338.7
Accumulated Amortization	44.5	30.0
Net Book Value	270.2	308.7
Acquired technologies
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (Years), Minimum	5
Useful life (Years), Maximum	34
Original Cost	128.5	101.7
Accumulated Amortization	46.5	41.7
Net Book Value	82.0	60.0
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (Years)	Indefinite
Original Cost	19.9
Net Book Value	19.9
Trademarks and patents
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (Years), Minimum	5
Useful life (Years), Maximum	30
Original Cost	29.9	28.6
Accumulated Amortization	21.2	19.3
Net Book Value	8.7	9.3
Technical qualifications, plans and drawings
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (Years), Minimum	15
Useful life (Years), Maximum	22
Original Cost	30.4	30.5
Accumulated Amortization	25.0	23.7
Net Book Value	5.4	6.8
Replacement parts annuity and product approvals
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (Years), Minimum	20
Useful life (Years), Maximum	22
Original Cost	39.5	39.7
Accumulated Amortization	36.0	34.3
Net Book Value	3.5	5.4
Covenants not to compete and other identified intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (Years), Minimum	20
Useful life (Years), Maximum	30
Original Cost	5.7	5.7
Accumulated Amortization	5.6	5.4
Net Book Value	$ 0.1	$ 0.3