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Long-Term Debt - Senior Secured Credit Facilities (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 06, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 29, 2019
Debt Instrument [Line Items]
Proceeds from Issuance of Long-term Debt		$ 408.0	$ 356.3	$ 509.6
Repayments of Long-term Debt		610.5	545.5	681.2
Payments of Debt Issuance Costs		11.0	3.3	$ 6.9
Term Loan A [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Long-term Debt	$ 100.0
Term Loan B [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Long-term Debt	1,550.0
Multi-Currency Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 932.0				$ 925.0
Multi-Currency Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity		891.2
Letters of Credit Outstanding, Amount		33.8
Secured Debt [Member] | Term Loan B [Member]
Debt Instrument [Line Items]
Long-term debt		1,088.8	1,188.8
Write off of Deferred Debt Issuance Cost			1.0
Repayments of Long-term Debt		100.0	59.8
Interest Paid, Including Capitalized Interest, Operating and Investing Activities			0.4
Secured Debt [Member] | Term Loan A Due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt		323.0	340.0		$ 340.0
Repayments of Long-term Debt		15.0
Prepayment of 2021 Amount		12.8
Secured Debt [Member] | Term Loan A & Term Loan B [Member]
Debt Instrument [Line Items]
Write off of Deferred Debt Issuance Cost		1.2	$ 5.1
Secured Debt [Member] | Second Amendment to the Credit Amendments [Member]
Debt Instrument [Line Items]
Payments of Debt Issuance Costs		$ 4.6

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