Restructuring (Details 2) - USD ($) $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014	Dec. 31, 2014
Restructuring reserve
Costs incurred	$ 5.8			$ 0.4	$ 12.5	$ 7.2
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred	5.8			$ 0.4	12.5	$ 7.2
2015 Actions
Restructuring
Net pre-tax restructuring charges	5.0				10.3
Restructuring reserve
Costs incurred	5.0	$ 4.0	$ 1.3
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred	5.0	4.0	1.3
Remaining costs					11.1
Total restructuring costs	21.4				21.4
EMEA | Other Actions
Restructuring reserve
Costs incurred	0.6	0.5	0.3				$ 6.9
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred	0.6	0.5	0.3				6.9
Remaining costs					1.6
Total restructuring costs	9.9				9.9
EMEA | 2014 Actions
Restructuring reserve
Balance at the beginning of the period	6.4	6.1	6.9		6.9
Costs incurred	0.6	0.5	0.3
Utilization and foreign currency impact	(1.2)	(0.2)	(1.1)
Balance at the end of the period	5.8	6.4	6.1		5.8		6.9
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred	0.6	0.5	0.3
Americas and Asia Pacific | 2015 Actions
Restructuring reserve
Balance at the beginning of the period	5.0	1.3
Costs incurred	5.0	4.0	1.3
Utilization and foreign currency impact	(2.8)	(0.3)
Balance at the end of the period	7.2	5.0	1.3		7.2
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred	5.0	4.0	1.3
Asia Pacific | 2015 Actions
Restructuring
Net pre-tax restructuring charges	0.2				3.5
Summary of total expected, incurred and remaining pre-tax costs
Total restructuring costs	3.7				3.7
Americas | 2015 Actions
Restructuring
Net pre-tax restructuring charges	4.8				6.8
Summary of total expected, incurred and remaining pre-tax costs
Total restructuring costs	17.7				17.7
Severance | 2015 Actions
Restructuring reserve
Costs incurred	2.5	3.7
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred	2.5	3.7
Remaining costs					2.6
Total restructuring costs	8.8				8.8
Severance | EMEA | Other Actions
Restructuring reserve
Costs incurred	0.5	0.5					6.9
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred	0.5	0.5					6.9
Remaining costs					0.9
Total restructuring costs	8.8				8.8
Severance | EMEA | 2014 Actions
Restructuring reserve
Balance at the beginning of the period	6.4	6.1	6.9		6.9
Costs incurred	0.5	0.5
Utilization and foreign currency impact	(1.1)	(0.2)	(0.8)
Balance at the end of the period	5.8	6.4	6.1		5.8		$ 6.9
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred	0.5	0.5
Severance | Americas and Asia Pacific | 2015 Actions
Restructuring reserve
Balance at the beginning of the period	3.7
Costs incurred	2.5	3.7
Utilization and foreign currency impact	(1.1)
Balance at the end of the period	5.1	3.7			5.1
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred	2.5	3.7
Legal and consultancy | 2015 Actions
Restructuring reserve
Costs incurred	0.3
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred	0.3
Remaining costs					0.2
Total restructuring costs	0.5				0.5
Legal and consultancy | EMEA | Other Actions
Restructuring reserve
Costs incurred			0.2
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred			0.2
Total restructuring costs	0.2				0.2
Legal and consultancy | EMEA | 2014 Actions
Restructuring reserve
Costs incurred			0.2
Utilization and foreign currency impact			(0.2)
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred			0.2
Legal and consultancy | Americas and Asia Pacific | 2015 Actions
Restructuring reserve
Costs incurred	0.3
Utilization and foreign currency impact	(0.1)
Balance at the end of the period	0.2				0.2
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred	0.3
Asset write-downs | 2015 Actions
Restructuring reserve
Costs incurred	0.9	0.3
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred	0.9	0.3
Remaining costs					1.8
Total restructuring costs	3.0				3.0
Asset write-downs | EMEA | Other Actions
Restructuring reserve
Costs incurred	0.1		0.1
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred	0.1		0.1
Remaining costs					0.6
Total restructuring costs	0.8				0.8
Asset write-downs | EMEA | 2014 Actions
Restructuring reserve
Costs incurred	0.1		0.1
Utilization and foreign currency impact	(0.1)		(0.1)
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred	0.1		0.1
Asset write-downs | Americas and Asia Pacific | 2015 Actions
Restructuring reserve
Costs incurred	0.9	0.3
Utilization and foreign currency impact	(0.9)	(0.3)
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred	0.9	0.3
Facility exit and other | 2015 Actions
Restructuring reserve
Costs incurred	1.3		1.3
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred	1.3		1.3
Remaining costs					6.5
Total restructuring costs	9.1				9.1
Facility exit and other | EMEA | Other Actions
Summary of total expected, incurred and remaining pre-tax costs
Remaining costs					0.1
Total restructuring costs	0.1				0.1
Facility exit and other | Americas and Asia Pacific | 2015 Actions
Restructuring reserve
Balance at the beginning of the period	1.3	1.3
Costs incurred	1.3		1.3
Utilization and foreign currency impact	(0.7)
Balance at the end of the period	1.9	$ 1.3	1.3		$ 1.9
Summary of total expected, incurred and remaining pre-tax costs
Costs incurred	$ 1.3		$ 1.3