Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income on (Loss) Derivatives [Line Items]
Balance at December 31, 2016			$ (81.8)
OCI before reclassifications			270.3
Amounts reclassified from AOCI			2.7
Other comprehensive income, net of tax	$ 60.7	$ 40.7	273.0	$ 86.8
Balance at September 30, 2017	191.2		191.2
Foreign currency translation adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on (Loss) Derivatives [Line Items]
Balance at December 31, 2016			(67.9)
OCI before reclassifications			289.9
Amounts reclassified from AOCI			0.0
Other comprehensive income, net of tax			289.9
Balance at September 30, 2017	222.0		222.0
Fair value of derivative financial instruments, net of tax
Reclassification Adjustment out of Accumulated Other Comprehensive Income on (Loss) Derivatives [Line Items]
Balance at December 31, 2016			(19.5)
OCI before reclassifications			4.4
Amounts reclassified from AOCI			4.3
Other comprehensive income, net of tax			8.7
Balance at September 30, 2017	(10.8)		(10.8)
Fair value of investment securities, net of tax
Reclassification Adjustment out of Accumulated Other Comprehensive Income on (Loss) Derivatives [Line Items]
Balance at December 31, 2016			15.1
OCI before reclassifications			(22.8)
Amounts reclassified from AOCI			(1.6)
Other comprehensive income, net of tax			(24.4)
Balance at September 30, 2017	(9.3)		(9.3)
Post-retirement and pension liability adjustments, net of tax
Reclassification Adjustment out of Accumulated Other Comprehensive Income on (Loss) Derivatives [Line Items]
Balance at December 31, 2016			(9.5)
OCI before reclassifications			(1.2)
Amounts reclassified from AOCI			0.0
Other comprehensive income, net of tax			(1.2)
Balance at September 30, 2017	$ (10.7)		$ (10.7)