Accumulated Other Comprehensive Loss - Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Accumulated other comprehensive income (loss):
Balance - beginning of period	$ (1,589.1)	$ (1,921.6)
Other comprehensive income (loss) before reclassifications	91.1	94.8
Reclassification adjustments to earnings	4.7	11.4
Net other comprehensive income (loss)	95.8	113.5
Balance - end of period	(1,493.3)	(1,808.1)
Currency translation adjustment and other1
Accumulated other comprehensive income (loss):
Balance - beginning of period	(1,108.2)	(1,586.7)
Other comprehensive income (loss) before reclassifications	122.9	114.6
Reclassification adjustments to earnings	0.0	0.0
Net other comprehensive income (loss)	122.9	119.3
Balance - end of period	(985.3)	(1,467.4)
Unrealized gains (losses) on cash flow hedges, net of tax
Accumulated other comprehensive income (loss):
Balance - beginning of period	(112.6)	(46.3)
Other comprehensive income (loss) before reclassifications	8.3	(6.9)
Reclassification adjustments to earnings	4.6	(0.4)
Net other comprehensive income (loss)	12.9	(7.3)
Balance - end of period	(99.7)	(53.6)
Unrealized gains (losses) on net investment hedges, net of tax
Accumulated other comprehensive income (loss):
Balance - beginning of period	3.4	88.6
Other comprehensive income (loss) before reclassifications	(32.9)	(10.2)
Reclassification adjustments to earnings	(2.8)	0.0
Net other comprehensive income (loss)	(35.7)	(10.2)
Balance - end of period	(32.3)	78.4
Pension gains (losses), net of tax
Accumulated other comprehensive income (loss):
Balance - beginning of period	(371.7)	(377.2)
Other comprehensive income (loss) before reclassifications	(7.2)	(2.7)
Reclassification adjustments to earnings	2.9	11.8
Net other comprehensive income (loss)	(4.3)	11.7
Balance - end of period	$ (376.0)	(365.5)
Disposal Group, Not Discontinued Operations [Member] | Currency translation adjustment and other1
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 gains (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 gains (losses), net of tax
Accumulated other comprehensive income (loss):
Reclassification adjustments to earnings		$ 2.6