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Debt Obligations (Details Textual) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended
	Mar. 18, 2019	Oct. 17, 2018	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	May 22, 2019
Debt Instrument [Line Items]
Senior notes			$ 703.7
Conversion price	$ 188.73
Debt instrument, convertible, carrying amount of equity component			99.7
Debt instrument, interest rate during period	100.00%
Line of credit facility, expiration date		Oct. 17, 2023
Line of credit, current			0.8		$ 0.9
Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			200.0
Due 2049 [Member]
Debt Instrument [Line Items]
Sale of convertible senior notes	$ 525.0
Interest expense, debt			1.0	$ 1.0
Amortization of debt discount (premium)			$ 3.9	$ 3.7
Debt instrument, interest rate during period			4.40%
Debt instrument, unamortized discount			$ 68.8
Senior Notes, 1.375 Percent due 2026 [Member]
Debt Instrument [Line Items]
Senior notes						$ 669.9
Long-term debt, percentage bearing fixed interest, percentage rate			1.375%
Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, applicable margin			1.125%
Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, applicable margin			0.175%
Maximum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, applicable margin			2.00%
Maximum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, applicable margin			1.00%
Swingline loans [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 50.0
Foreign Swingline Loans [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			90.0
Unsecured Debt [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 1,000.0
Euro Member Countries, Euro
Debt Instrument [Line Items]
Senior notes			$ 600.0
Euro Member Countries, Euro \| Senior Notes, 1.375 Percent due 2026 [Member]
Debt Instrument [Line Items]
Senior notes						$ 600.0