Accumulated Other Comprehensive Loss - Changes in AOCI (Details) - USD ($) $ in Millions	6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016
Accumulated other comprehensive income (loss):
Balance - beginning of period	$ (1,921.2)	$ (1,694.2)
Other comprehensive income (loss) before reclassifications	(178.0)	13.0
Reclassification adjustments to earnings	13.5	(4.0)
Net other comprehensive income (loss)	198.8	(17.0)
Balance - end of period	(1,722.4)	(1,711.2)
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	(300.8)	5.1
Reclassification adjustments to earnings	0.0	0.0
Net other comprehensive income (loss)	305.5	(5.1)
Balance - end of period	(1,280.8)	(1,306.0)
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	44.7	43.4
Reclassification adjustments to earnings	(1.4)	(9.8)
Net other comprehensive income (loss)	(46.1)	(53.2)
Balance - end of period	(92.4)	(105.3)
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	57.8	(23.7)
Reclassification adjustments to earnings	0.0	0.0
Net other comprehensive income (loss)	(57.8)	23.7
Balance - end of period	30.8	35.5
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	20.3	(11.8)
Reclassification adjustments to earnings	14.9	5.8
Net other comprehensive income (loss)	(2.8)	17.6
Balance - end of period	(380.0)	$ (335.4)
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