Goodwill and Other Intangible Assets, net - Changes in Goodwill by Segment (Details) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($)
Changes in goodwill:
Balance at December 31, 2014	$ 1,853.6
Acquisitions	33.2
Currency translation	(69.6)
Other	(0.2)
Balance at June 30, 2015	1,817.0
Americas
Changes in goodwill:
Balance at December 31, 2014	1,042.3
Acquisitions	16.1
Currency translation	(7.0)
Other	0.0
Balance at June 30, 2015	1,051.4
EMEA-APAC
Changes in goodwill:
Balance at December 31, 2014	811.3
Acquisitions	17.1
Currency translation	(62.6)
Other	(0.2)
Balance at June 30, 2015	$ 765.6