Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	$ (293.8)	$ (530.3)	$ (421.2)	$ (160.7)
Hedge instruments	(1.3)	5.0	(2.0)	1.7
Defined benefit postretirement plans	(197.6)	(198.1)	(189.9)	(227.3)
Other	2.7	1.3	2.9	2.7
Accumulated other comprehensive loss	(490.0)	(722.1)	(610.2)	$ (383.6)
Comprehensive (loss) income before reclassifications, Foreign currency translation adjustments	236.5	(109.1)	(260.5)
Comprehensive (loss) income before reclassifications, Hedge instruments	(4.5)	8.0	2.6
Comprehensive (loss) income before reclassifications, Defined benefit postretirement plans	(5.0)	(11.4)	44.9
Comprehensive (loss) income before reclassifications, Other	1.4	(1.6)	0.2
Comprehensive (loss) income before reclassifications, Total	228.4	(114.1)	(212.8)
Income taxes associated with comprehensive (loss) income before reclassifications, Hedge instruments	1.0	(0.7)	(1.6)
Income taxes associated with comprehensive (loss) income before reclassifications, Defined benefit postretirement plans	(0.5)	(2.6)	(14.3)
Income taxes associated with comprehensive (loss) income before reclassifications, Total	0.5	(3.3)	(15.9)
Reclassification from accumulated other comprehensive (loss) income, Hedge instruments	(3.8)	0.1	(6.1)
Reclassification from accumulated other comprehensive (loss) income, Defined benefit postretirement plans	8.5	8.3	9.6
Reclassification from accumulated other comprehensive (loss) income, Total	4.7	8.4	3.5
Income taxes reclassified into net earnings, Hedge instruments	1.0	(0.4)	1.4
Income taxes reclassified into net earnings, Defined benefit postretirement plans	(2.5)	(2.5)	(2.8)
Income taxes reclassified into net earnings, Total	$ (1.5)	$ (2.9)	$ (1.4)