Comprehensive Income, Accumulated Other Comprehensive Income (Loss), Net of Related Tax (Details) $ in Millions	3 Months Ended
	Apr. 01, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ 1,251.7	[1]
Other comprehensive income before reclassifications	16.3
Amounts reclassified from AOCI	1.9
Net current period other comprehensive income	18.2
Balance at end of period	1,302.8	[2]
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(186.1)
Balance at end of period	(167.9)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(104.1)
Other comprehensive income before reclassifications	14.7
Amounts reclassified from AOCI	0.0
Net current period other comprehensive income	14.7
Balance at end of period	(89.4)
Unrecognized Pension Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(86.5)
Other comprehensive income before reclassifications	0.0
Amounts reclassified from AOCI	1.9
Net current period other comprehensive income	1.9
Balance at end of period	(84.6)
Net Gain on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	4.5
Other comprehensive income before reclassifications	1.6
Amounts reclassified from AOCI	0.0
Net current period other comprehensive income	1.6
Balance at end of period	$ 6.1

[1] Condensed from audited financial statements

[2] Unaudited