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Long-Term Debt - Long-term Debt Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jul. 29, 2019	Dec. 31, 2018	Mar. 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 3,692.2		$ 3,875.5
Current portion of long-term debt	28.7		121.6
Long-term debt and capital lease obligations	3,663.5		3,753.9
Unamortized debt issuance costs	63.3		80.7
Long-term debt, net	3,612.3		3,686.8
Total Debt Instruments excluding Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs	51.2		67.1
Multi-Currency Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	0.0		0.0
Secured Debt [Member] | Term Loan A Due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt	340.0	$ 340.0
Secured Debt [Member] | Term Loan A [Member]
Debt Instrument [Line Items]
Long-term debt			83.8
Secured Debt [Member] | Term Loan B [Member]
Debt Instrument [Line Items]
Long-term debt	1,188.8		1,511.2
Unsecured Debt [Member] | 7.75% Notes [Member]
Debt Instrument [Line Items]
Long-term debt	0.0		100.0
Unsecured Debt [Member] | 6.625% Notes [Member]
Debt Instrument [Line Items]
Long-term debt	450.0		450.0
Unsecured Debt [Member] | 6.50% Notes [Member]
Debt Instrument [Line Items]
Long-term debt	500.0		500.0		$ 500.0
Unsecured Debt [Member] | 6.25% Notes Due 2026 [Member]
Debt Instrument [Line Items]
Long-term debt	400.0		400.0	$ 400.0
Unsecured Debt [Member] | 6.25% Notes due 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	700.0		700.0		$ 700.0
Foreign Credit Facilities and Other [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	113.4
Foreign Credit Facilities [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	106.0		127.1
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital lease obligations	$ 0.0		$ 3.4

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Long-Term Debt, net of Issuance Costs based on application of ASU 2015-03.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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