CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (10.6)	$ 54.4	$ 113.7
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment, net of (provision for) benefit from taxes of $(3.0), $(3.9) and $0.0, respectively	63.0	17.4	(80.9)
Derivative hedging adjustment, net of (provision for) benefit from taxes of $1.6, $(1.6) and $1.7, respectively	(5.2)	3.6	(6.5)
Debt and equity securities adjustment, net of (provision for) benefit from taxes of $0.0, $0.0 and $0.0, respectively	(1.4)	1.8	(0.9)
Pension liability adjustment:
Net gain (loss), net of (provision for) benefit from taxes of $1.7, $1.9 and $1.0, respectively	(6.3)	(7.8)	(4.3)
Amortization of actuarial (gain) loss, net of provision for (benefit from) taxes of $(0.4), $(0.6) and $(1.7), respectively	1.3	1.9	5.8
Settlement of U.S. defined benefit pension obligations, net of provision for (benefit from) taxes of $0.0, $0.0 and $(24.4), respectively	0.0	0.0	42.6
Divestiture of business, net of provision for (benefit from) taxes of $0.0, $(5.3) and $0.0, respectively	0.0	12.6	0.0
Foreign exchange and other effects, net of (provision for) benefit from taxes of $(0.6), $(0.7) and $0.2, respectively	(2.3)	(2.2)	1.5
Total pension liability adjustment	(7.3)	4.5	45.6
Other comprehensive income (loss)	49.1	27.3	(42.7)
Comprehensive income (loss)	$ 38.5	$ 81.7	$ 71.0