Financial Instruments and Fair Value Measurements - Recurring Fair Value Measurements with Significant Unobservable Inputs (Details) (Contingent consideration, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Range of potential payments:
Low	$ 2
High	19
Level 3
Changes in recurring fair value measurements with significant unobservable inputs:
Beginning balance	11.6
Acquisitions	8.7
Settlements in cash	(1.0)
Currency translation	(0.2)
Ending balance	$ 19.1