Accumulated Other Comprehensive Loss - Changes in AOCI (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016
Accumulated other comprehensive income (loss):
Balance - beginning of period	$ (1,921.2)	$ (1,694.2)
Other comprehensive income (loss) before reclassifications	278.8	10.1
Reclassification adjustments to earnings	(16.3)	(2.3)
Net other comprehensive income (loss)	302.4	12.4
Balance - end of period	(1,618.8)	(1,681.8)
Currency translation adjustment and other
Accumulated other comprehensive income (loss):
Balance - beginning of period	(1,586.3)	(1,300.9)
Other comprehensive income (loss) before reclassifications	452.5	9.9
Reclassification adjustments to earnings	0.0	0.0
Net other comprehensive income (loss)	457.2	9.9
Balance - end of period	(1,129.1)	(1,291.0)
Unrealized losses on cash flow hedges, net of tax
Accumulated other comprehensive income (loss):
Balance - beginning of period	(46.3)	(52.1)
Other comprehensive income (loss) before reclassifications	(69.4)	(48.9)
Reclassification adjustments to earnings	1.4	6.2
Net other comprehensive income (loss)	(70.8)	(55.1)
Balance - end of period	(117.1)	(107.2)
Unrealized gains (losses) on net investment hedges, net of tax
Accumulated other comprehensive income (loss):
Balance - beginning of period	88.6	11.8
Other comprehensive income (loss) before reclassifications	(85.3)	35.2
Reclassification adjustments to earnings	0.0	0.0
Net other comprehensive income (loss)	(85.3)	35.2
Balance - end of period	3.3	47.0
Pension (losses) gains, net of tax
Accumulated other comprehensive income (loss):
Balance - beginning of period	(377.2)	(353.0)
Other comprehensive income (loss) before reclassifications	(19.0)	13.9
Reclassification adjustments to earnings	(17.7)	(8.5)
Net other comprehensive income (loss)	1.3	22.4
Balance - end of period	(375.9)	$ (330.6)
Disposal Group, Not Discontinued Operations [Member] | Currency translation adjustment and other
Accumulated other comprehensive income (loss):
Reclassification adjustments to earnings	4.7
Disposal Group, Not Discontinued Operations [Member]
Accumulated other comprehensive income (loss):
Reclassification adjustments to earnings	7.3
Disposal Group, Not Discontinued Operations [Member] | Unrealized losses on cash flow hedges, net of tax
Accumulated other comprehensive income (loss):
Reclassification adjustments to earnings	0.0
Disposal Group, Not Discontinued Operations [Member] | Unrealized gains (losses) on net investment hedges, net of tax
Accumulated other comprehensive income (loss):
Reclassification adjustments to earnings	0.0
Disposal Group, Not Discontinued Operations [Member] | Pension (losses) gains, net of tax
Accumulated other comprehensive income (loss):
Reclassification adjustments to earnings	$ (2.6)