Accumulated Other Comprehensive Income (Loss) (Change in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			$ 168.9	$ 242.9
Amounts reclassified from accumulated other comprehensive income (loss)	$ 3.5	$ 14.8	38.9	35.7
Ending Balance	123.0	277.0	123.0	277.0
Accumulated Other Comprehensive Income/(Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			(286.4)	(340.2)
Other comprehensive income (loss) before reclassifications			21.8	12.3
Amounts reclassified from accumulated other comprehensive income (loss)			38.9	35.7
Net current - period other comprehensive income (loss)			60.7	48.0
Ending Balance	(225.7)	(292.2)	(225.7)	(292.2)
Foreign currency translation
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			(228.2)	(275.6)
Other comprehensive income (loss) before reclassifications			21.8	12.3
Amounts reclassified from accumulated other comprehensive income (loss)	2.4		36.9	31.8
Net current - period other comprehensive income (loss)			58.7	44.1
Ending Balance	(169.5)	(231.5)	(169.5)	(231.5)
Change of fair value of pension benefit obligation
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			(58.2)	(64.6)
Other comprehensive income (loss) before reclassifications			0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss)	1.1	1.3	2.0	3.9
Net current - period other comprehensive income (loss)			2.0	3.9
Ending Balance	$ (56.2)	$ (60.7)	$ (56.2)	$ (60.7)