Other Comprehensive Income (Loss) (Schedule of Changes in AOCL by Component) (Details) - USD ($)	3 Months Ended	6 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (4,800,000)
Other comprehensive income (loss)
Total Other Comprehensive Income (Loss), net of tax	(62,300,000)	$ (5,000,000.0)	$ (41,100,000)	$ (21,900,000)
Accumulated other comprehensive loss
Beginning balance			1,573,300,000
Net activity	(62,300,000)	(5,000,000.0)	(41,100,000)	(21,900,000)
Ending balance	1,548,900,000		1,548,900,000
Income tax expense	9,900,000	11,200,000	12,700,000	18,600,000
Net Income (Loss) Attributable to Parent	46,900,000	49,500,000	86,700,000	91,700,000
Available-for-sale Securities and Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(800,000)
Other comprehensive income (loss)
Prior to reclassification	(29,500,000)	(1,700,000)	(33,700,000)	(3,400,000)
Reclassification from	(400,000)	(1,800,000)	500,000	(4,000,000.0)
Pre-tax	(29,900,000)	(3,500,000)	(33,200,000)	(7,400,000)
Tax effect	6,800,000	1,600,000	7,500,000	1,800,000
Total Other Comprehensive Income (Loss), net of tax	(23,100,000)	(1,900,000)	(25,700,000)	(5,600,000)
Accumulated other comprehensive loss
Beginning balance	4,600,000	13,900,000	7,200,000	16,800,000
Net activity	(23,100,000)	(1,900,000)	(25,700,000)	(5,600,000)
Ending balance	(18,500,000)	12,000,000.0	(18,500,000)	12,000,000.0
Net Income (Loss) Attributable to Parent	300,000	1,400,000	(300,000)	2,900,000
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				0
Other comprehensive income (loss)
Prior to reclassification	(31,600,000)	(3,600,000)	(8,500,000)	(17,200,000)
Reclassification from	0	0	0	0
Pre-tax	(31,600,000)	(3,600,000)	(8,500,000)	(17,200,000)
Tax effect	0	0	0	0
Total Other Comprehensive Income (Loss), net of tax	(31,600,000)	(3,600,000)	(8,500,000)	(17,200,000)
Accumulated other comprehensive loss
Beginning balance	(122,300,000)	(118,900,000)	(145,400,000)	(105,300,000)
Net activity	(31,600,000)	(3,600,000)	(8,500,000)	(17,200,000)
Ending balance	(153,900,000)	(122,500,000)	(153,900,000)	(122,500,000)
Change in Pension and Postretirement Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				6,200,000
Other comprehensive income (loss)
Prior to reclassification	100,000	100,000	(100,000)	100,000
Reclassification from	(10,300,000)	600,000	(9,100,000)	1,100,000
Pre-tax	(10,200,000)	700,000	(9,200,000)	1,200,000
Tax effect	(2,600,000)	200,000	(2,300,000)	300,000
Total Other Comprehensive Income (Loss), net of tax	(7,600,000)	500,000	(6,900,000)	900,000
Accumulated other comprehensive loss
Beginning balance	(43,600,000)	(30,300,000)	(44,300,000)	(24,500,000)
Net activity	(7,600,000)	500,000	(6,900,000)	900,000
Ending balance	(51,200,000)	(29,800,000)	(51,200,000)	(29,800,000)
Income tax expense	2,600,000	(200,000)	2,300,000	(6,500,000)
Change in Pension and Postretirement Defined Benefit Plans [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated other comprehensive loss
Net Income (Loss) Attributable to Parent	7,700,000	(400,000)	6,800,000	5,400,000
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(5,400,000)
Other comprehensive income (loss)
Prior to reclassification	(61,000,000.0)	(5,200,000)	(42,300,000)	(20,500,000)
Reclassification from	(10,700,000)	(1,200,000)	(8,600,000)	(2,900,000)
Pre-tax	(71,700,000)	(6,400,000)	(50,900,000)	(23,400,000)
Tax effect	9,400,000	1,400,000	(9,800,000)	(1,500,000)
Total Other Comprehensive Income (Loss), net of tax	(62,300,000)	(5,000,000.0)	(41,100,000)	(21,900,000)
Accumulated other comprehensive loss
Beginning balance	(161,300,000)	(135,300,000)	(182,500,000)	(113,000,000.0)
Net activity	(62,300,000)	(5,000,000.0)	(41,100,000)	(21,900,000)
Ending balance	(223,600,000)	(140,300,000)	(223,600,000)	(140,300,000)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Other comprehensive income (loss)
Reclassification from	400,000	1,800,000	(500,000)	4,000,000.0
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated other comprehensive loss
Income tax expense	100,000	400,000	(200,000)	1,100,000
Foreign Exchange Forward [Member] \| Available-for-sale Securities and Hedges [Member]
Other comprehensive income (loss)
Pre-tax	0	(800,000)	(200,000)	300,000
Total Other Comprehensive Income (Loss), net of tax	0	(500,000)	(200,000)	200,000
Accumulated other comprehensive loss
Beginning balance	0	900,000	200,000	200,000
Net activity	0	(500,000)	(200,000)	200,000
Ending balance	0	400,000	0	400,000
Foreign Exchange Forward [Member] \| Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Other comprehensive income (loss)
Tax effect	0	(300,000)	0	100,000
Interest Rate Swap [Member] \| Available-for-sale Securities and Hedges [Member]
Other comprehensive income (loss)
Pre-tax	(40,100,000)	(10,800,000)	(38,400,000)	(18,000,000.0)
Total Other Comprehensive Income (Loss), net of tax	(30,900,000)	(8,500,000)	(29,600,000)	(13,800,000)
Accumulated other comprehensive loss
Beginning balance	(3,900,000)	13,800,000	(5,200,000)	18,300,000
Net activity	(30,900,000)	(8,500,000)	(29,600,000)	(13,800,000)
Ending balance	(34,800,000)	5,300,000	(34,800,000)	5,300,000
Interest Rate Swap [Member] \| Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				800,000
Other comprehensive income (loss)
Prior to reclassification	(39,700,000)	(9,100,000)	(38,800,000)	(14,200,000)
Reclassification from	400,000	1,700,000	(400,000)	3,800,000
Tax effect	(9,200,000)	(2,300,000)	(8,800,000)	(4,200,000)
Accumulated other comprehensive loss
Income tax expense	100,000	500,000	(100,000)	1,100,000
Net Income (Loss) Attributable to Parent	(300,000)	(1,200,000)	300,000	(2,700,000)
Currency Swap [Member] \| Available-for-sale Securities and Hedges [Member]
Accumulated other comprehensive loss
Beginning balance	8,500,000	(800,000)	12,200,000	(1,700,000)
Currency Swap [Member] \| Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				0
Other comprehensive income (loss)
Prior to reclassification	10,200,000	8,100,000	5,400,000	10,300,000
Reclassification from	0	0	0	0
Tax effect	2,400,000	1,000,000.0	1,300,000	2,300,000
Foreign Exchange Contract [Member] \| Available-for-sale Securities and Hedges [Member]
Other comprehensive income (loss)
Pre-tax	10,200,000	8,100,000	5,400,000	10,300,000
Total Other Comprehensive Income (Loss), net of tax	7,800,000	7,100,000	4,100,000	8,000,000.0
Accumulated other comprehensive loss
Net activity	7,800,000	7,100,000	4,100,000	8,000,000.0
Ending balance	16,300,000	6,300,000	16,300,000	6,300,000
Foreign Exchange \| Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				0
Other comprehensive income (loss)
Prior to reclassification	0	(700,000)	(300,000)	500,000
Reclassification from	0	100,000	(100,000)	200,000
Accumulated other comprehensive loss
Income tax expense	0	(100,000)	(100,000)	0
Net Income (Loss) Attributable to Parent	$ 0	$ (200,000)	$ 0	$ (200,000)

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