Fair Value Measurements - Defined Benefit Plan Assets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S. Plans:
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 265.6	$ 274.1	$ 282.7
Non-U.S. Plans:
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	395.6	345.0	177.9
Fair Value, Measurements, Recurring [Member] | U.S. Plans:
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	265.6	274.1
Fair Value, Measurements, Recurring [Member] | U.S. Plans: | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	44.2	50.5
Fair Value, Measurements, Recurring [Member] | U.S. Plans: | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	221.4	223.6
Fair Value, Measurements, Recurring [Member] | Non-U.S. Plans:
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	395.6	345.0
Fair Value, Measurements, Recurring [Member] | Non-U.S. Plans: | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	89.9	70.5
Fair Value, Measurements, Recurring [Member] | Non-U.S. Plans: | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	305.7	274.5
Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Plans:
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	145.7	147.2
Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Plans: | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	145.7	147.2
Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] | Non-U.S. Plans:
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	188.2	143.7
Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] | Non-U.S. Plans: | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	188.2	143.7
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Plans:
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	92.0	100.9
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Plans: | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	44.2	50.5
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Plans: | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	47.8	50.4
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Non-U.S. Plans:
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	194.8	188.2
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Non-U.S. Plans: | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	89.9	70.5
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Non-U.S. Plans: | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	104.9	117.7
Real estate and other | Fair Value, Measurements, Recurring [Member] | U.S. Plans:
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	27.9	26.0
Real estate and other | Fair Value, Measurements, Recurring [Member] | U.S. Plans: | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	27.9	26.0
Real estate and other | Fair Value, Measurements, Recurring [Member] | Non-U.S. Plans:
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	12.6	13.1
Real estate and other | Fair Value, Measurements, Recurring [Member] | Non-U.S. Plans: | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 12.6	$ 13.1