Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Foreign currency translation adjustments, tax (expense) benefit	$ 0.0	$ 7.9	$ 3.6
Net gains (losses) on hedging instruments, tax benefit	(9.7)	(6.9)	16.6
Net pension and other post-retirement benefits, tax (expense) benefit	$ 25.5	$ (20.3)	$ 15.5