Goodwill and Other Assets (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill	$ 1,302.4	$ 1,289.0	$ 452.2
Accumulated impairment losses	(290.7)	(290.7)	(290.7)
Beginning balance	998.3	161.5
Goodwill acquired		882.6
Goodwill adjustment		(0.5)
Currency translation adjustment	13.4	(45.3)
Ending balance	1,011.7	998.3
Services Segment [Member]
Goodwill [Line Items]
Goodwill	898.3	890.0	452.2
Accumulated impairment losses	(290.7)	(290.7)	(290.7)
Beginning balance	599.3	161.5
Goodwill acquired		459.1
Goodwill adjustment		(0.5)
Currency translation adjustment	8.3	(20.8)
Ending balance	607.6	599.3
Software Segment [Member]
Goodwill [Line Items]
Goodwill	227.8	224.9	0.0
Accumulated impairment losses	0.0	0.0	0.0
Beginning balance	224.9	0.0
Goodwill acquired		238.7
Goodwill adjustment		0.0
Currency translation adjustment	2.9	(13.8)
Ending balance	227.8	224.9
Systems Segment [Member]
Goodwill [Line Items]
Goodwill	176.3	174.1	0.0
Accumulated impairment losses	0.0	0.0	$ 0.0
Beginning balance	174.1	0.0
Goodwill acquired		184.8
Goodwill adjustment		0.0
Currency translation adjustment	2.2	(10.7)
Ending balance	$ 176.3	$ 174.1

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e961-128460

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