Accumulated Other Comprehensive Income (Loss) - Components (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	$ 603.0	$ 753.1	$ 668.9	$ 768.7
Balance at end of period	458.8	745.1	458.8	745.1
Cumulative Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(96.0)	(112.1)	(106.7)	(111.8)
Other comprehensive income (loss)	(1.1)	3.0	9.6	2.7
Balance at end of period	(97.1)	(109.1)	(97.1)	(109.1)
Pension and Other Postretirement Benefit Plans, Net
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(55.1)	(40.4)	(56.3)	(39.4)
Other comprehensive income (loss)			0.6	(2.0)
Amounts reclassified from AOCI to net income	0.5	0.3	1.1	1.3
Balance at end of period	(54.6)	(40.1)	(54.6)	(40.1)
Accumulated Gain Loss Net Cash Flow Hedge Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(3.1)	9.0	0.6	8.9
Other comprehensive income (loss)	(1.5)	(3.5)	(5.1)	(2.4)
Amounts reclassified from AOCI to net income	0.2	(1.9)	0.1	(2.9)
Balance at end of period	(4.4)	3.6	(4.4)	3.6
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(154.2)	(143.5)	(162.4)	(142.3)
Other comprehensive income (loss)	(2.6)	(0.5)	5.1	(1.7)
Amounts reclassified from AOCI to net income	0.7	(1.6)	1.2	(1.6)
Balance at end of period	$ (156.1)	$ (145.6)	$ (156.1)	$ (145.6)