Goodwill and Other Intangible Assets, net - Gross Amount of Goodwill and Accumulated Impairment Losses by Segment (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Gross amount of goodwill and accumulated impairment losses:
Gross Carrying Amount	$ 1,978.6	$ 2,060.2
Accumulated Impairment Losses	206.6	206.6
Net Carrying Amount	1,772.0	1,853.6
Americas
Gross amount of goodwill and accumulated impairment losses:
Gross Carrying Amount	1,255.2	1,248.9
Accumulated Impairment Losses	206.6	206.6
Net Carrying Amount	1,048.6	1,042.3
EMEA-APAC
Gross amount of goodwill and accumulated impairment losses:
Gross Carrying Amount	723.4	811.3
Accumulated Impairment Losses	0	0
Net Carrying Amount	$ 723.4	$ 811.3