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Acquisitions (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allocation of Consideration Transferred:
Goodwill		$ 127.8us-gaap_Goodwill	$ 127.4us-gaap_Goodwill	$ 115.9us-gaap_Goodwill
SkyScan N.V.
Consideration Transferred:
Cash paid	24.6
Cash acquired	(2.9)
Contingent consideration	4.0
Total consideration transferred	25.7
Allocation of Consideration Transferred:
Accounts receivable	3.1
Inventories	6.6
Other current assets	0.3
Property, plant and equipment	2.3
Goodwill	10.6
Liabilities assumed	(10.8)
Total consideration transferred	25.7
Maximum potential payments related to the contingent consideration	5.9
SkyScan N.V. \| Existing technology and related patents
Allocation of Consideration Transferred:
Intangible assets	7.2
Weighted average amortization period	7 years
SkyScan N.V. \| Customer relationships
Allocation of Consideration Transferred:
Intangible assets	$ 6.4
Weighted average amortization period	10 years