Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ (2.1)	$ (118.9)	$ 41.3	$ (50.1)
Other comprehensive income (loss) before reclassifications and income taxes	21.0	23.0	(22.0)	(49.7)
Amounts reclassified from accumulated other comprehensive (loss) income before income taxes	(0.4)	(3.3)	(0.9)	(5.9)
Income tax benefit	0.7	1.2	0.4	0.2
Net current period other comprehensive income (loss), net of income taxes	21.3	20.9	(22.5)	(55.4)
Noncontrolling interest	0.6	(1.2)	1.0	6.3
Net current period comprehensive income (loss), net of income taxes and noncontrolling interest	21.9	19.7	(21.5)	(49.1)
Ending Balance	19.8	(99.2)	19.8	(99.2)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(62.0)	(186.6)	(18.0)	(115.3)
Other comprehensive income (loss) before reclassifications and income taxes	23.2	24.5	(21.2)	(54.3)
Amounts reclassified from accumulated other comprehensive (loss) income before income taxes	0.0	0.0	0.0	0.0
Income tax benefit	0.0	0.0	0.0	0.0
Net current period other comprehensive income (loss), net of income taxes	23.2	24.5	(21.2)	(54.3)
Noncontrolling interest	0.6	(1.2)	1.0	6.3
Net current period comprehensive income (loss), net of income taxes and noncontrolling interest	23.8	23.3	(20.2)	(48.0)
Ending Balance	(38.2)	(163.3)	(38.2)	(163.3)
Pension and other postretirement liability adjustments
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	61.8	65.6	63.4	66.9
Other comprehensive income (loss) before reclassifications and income taxes	(0.1)	0.0	(0.1)	0.2
Amounts reclassified from accumulated other comprehensive (loss) income before income taxes	(2.1)	(2.0)	(4.3)	(4.0)
Income tax benefit	0.5	0.5	1.1	1.0
Net current period other comprehensive income (loss), net of income taxes	(1.7)	(1.5)	(3.3)	(2.8)
Noncontrolling interest	0.0	0.0	0.0	0.0
Net current period comprehensive income (loss), net of income taxes and noncontrolling interest	(1.7)	(1.5)	(3.3)	(2.8)
Ending Balance	60.1	64.1	60.1	64.1
Unrealized gain (loss) on marketable securities
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	0.0	(0.4)	0.0	0.0
Other comprehensive income (loss) before reclassifications and income taxes	0.0	0.7	0.0	0.2
Amounts reclassified from accumulated other comprehensive (loss) income before income taxes	0.0	0.0	0.0	0.0
Income tax benefit	0.0	(0.2)	0.0	(0.1)
Net current period other comprehensive income (loss), net of income taxes	0.0	0.5	0.0	0.1
Noncontrolling interest	0.0	0.0	0.0	0.0
Net current period comprehensive income (loss), net of income taxes and noncontrolling interest	0.0	0.5	0.0	0.1
Ending Balance	0.0	0.1	0.0	0.1
Change in fair value of derivative financial instruments
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(1.9)	2.5	(4.1)	(1.7)
Other comprehensive income (loss) before reclassifications and income taxes	(2.1)	(2.2)	(0.7)	4.2
Amounts reclassified from accumulated other comprehensive (loss) income before income taxes	1.7	(1.3)	3.4	(1.9)
Income tax benefit	0.2	0.9	(0.7)	(0.7)
Net current period other comprehensive income (loss), net of income taxes	(0.2)	(2.6)	2.0	1.6
Noncontrolling interest	0.0	0.0	0.0	0.0
Net current period comprehensive income (loss), net of income taxes and noncontrolling interest	(0.2)	(2.6)	2.0	1.6
Ending Balance	$ (2.1)	$ (0.1)	$ (2.1)	$ (0.1)