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Financial Instruments and Fair Value Measurements - Derivative Financial Instruments (Details) £ in Millions, $ in Millions	Mar. 31, 2021 GBP (£) derivative Rate	Mar. 31, 2021 USD ($) derivative Rate	Dec. 31, 2020 USD ($)	Feb. 29, 2020 derivative
Derivative [Line Items]
Notional Amount		$ 2,028.5	$ 1,541.4
Fair Value - asset (liability)		(33.2)	(81.5)
Interest rate swap, maturity Mar 2024 | Designated as hedging instrument | Cash flow hedge
Derivative [Line Items]
Notional Amount		$ 250.0	250.0
Strike (percent)	3.04%	3.04%
Fair Value - asset (liability)		$ (19.4)	(22.6)
Cross-currency swap, maturity May 2034 1 | Designated as hedging instrument | Cash flow hedge
Derivative [Line Items]
Notional Amount		41.6	41.6
Fair Value - asset (liability)		$ (6.0)	(5.2)
Cross-currency swap, maturity May 2034 1 | Designated as hedging instrument | Cash flow hedge | GBP | Minimum
Derivative [Line Items]
Strike (percent)	4.82%	4.82%
Cross-currency swap, maturity May 2034 1 | Designated as hedging instrument | Cash flow hedge | GBP | Maximum
Derivative [Line Items]
Strike (percent)	10.96%	10.96%
Cross-currency swap, maturity May 2034 1 | Designated as hedging instrument | Cash flow hedge | USD
Derivative [Line Items]
Strike (percent)	9.80%	9.80%
Cross-currency swap, maturity May 2034 2 | Designated as hedging instrument | Cash flow hedge
Derivative [Line Items]
Notional Amount		$ 41.6	41.6
Fair Value - asset (liability)		$ (6.1)	(5.1)
Cross-currency swap, maturity May 2034 2 | Designated as hedging instrument | Cash flow hedge | GBP | Minimum
Derivative [Line Items]
Strike (percent)	4.82%	4.82%
Cross-currency swap, maturity May 2034 2 | Designated as hedging instrument | Cash flow hedge | GBP | Maximum
Derivative [Line Items]
Strike (percent)	10.96%	10.96%
Cross-currency swap, maturity May 2034 2 | Designated as hedging instrument | Cash flow hedge | USD
Derivative [Line Items]
Strike (percent)	9.803%	9.803%
Cross-currency swap, maturity May 2034 3 | Designated as hedging instrument | Cash flow hedge
Derivative [Line Items]
Notional Amount		$ 41.6	41.6
Fair Value - asset (liability)		$ (6.3)	(5.4)
Cross-currency swap, maturity May 2034 3 | Designated as hedging instrument | Cash flow hedge | GBP | Minimum
Derivative [Line Items]
Strike (percent)	4.82%	4.82%
Cross-currency swap, maturity May 2034 3 | Designated as hedging instrument | Cash flow hedge | GBP | Maximum
Derivative [Line Items]
Strike (percent)	10.96%	10.96%
Cross-currency swap, maturity May 2034 3 | Designated as hedging instrument | Cash flow hedge | USD
Derivative [Line Items]
Strike (percent)	9.745%	9.745%
Cross-currency swap, maturity May 2034 4 | Designated as hedging instrument | Cash flow hedge
Derivative [Line Items]
Notional Amount		$ 41.6	41.6
Fair Value - asset (liability)		$ (6.6)	(5.7)
Cross-currency swap, maturity May 2034 4 | Designated as hedging instrument | Cash flow hedge | GBP | Minimum
Derivative [Line Items]
Strike (percent)	4.82%	4.82%
Cross-currency swap, maturity May 2034 4 | Designated as hedging instrument | Cash flow hedge | GBP | Maximum
Derivative [Line Items]
Strike (percent)	10.96%	10.96%
Cross-currency swap, maturity May 2034 4 | Designated as hedging instrument | Cash flow hedge | USD
Derivative [Line Items]
Strike (percent)	9.755%	9.755%
Currency exchange swap, maturity Jan 2021 | Not designated as hedging instrument
Derivative [Line Items]
Notional Amount		$ 0.0	625.0
Strike (rate) | Rate	135.00%	135.00%
Fair Value - asset (liability)		$ 0.0	(8.2)
Currency exchange swap, maturity Apr 2021 | Not designated as hedging instrument
Derivative [Line Items]
Notional Amount	£ 810.0	$ 1,112.1	0.0
Strike (rate) | Rate	137.00%	137.00%
Fair Value - asset (liability)		$ (3.7)	0.0
Forward-starting swap, maturity Jun 2033 1 | Designated as hedging instrument | Cash flow hedge
Derivative [Line Items]
Notional Amount		$ 75.0	75.0
Strike (percent)	2.02%	2.02%
Fair Value - asset (liability)		$ 2.0	(5.0)
Forward-starting swap, maturity Nov 2032 1 | Designated as hedging instrument | Cash flow hedge
Derivative [Line Items]
Notional Amount		$ 75.0	75.0
Strike (percent)	1.94%	1.94%
Fair Value - asset (liability)		$ 1.7	(5.2)
Forward-starting swap, maturity Nov 2032 2 | Designated as hedging instrument | Cash flow hedge
Derivative [Line Items]
Notional Amount		$ 25.0	25.0
Strike (percent)	1.67%	1.67%
Fair Value - asset (liability)		$ 1.2	(1.1)
Forward-starting swap, maturity Jun 2033 2 | Designated as hedging instrument | Cash flow hedge
Derivative [Line Items]
Notional Amount		$ 125.0	125.0
Strike (percent)	1.75%	1.75%
Fair Value - asset (liability)		$ 6.4	(5.2)
Forward-starting swap, hybrid debt, maturity Nov 2032 3 | Designated as hedging instrument | Cash flow hedge
Derivative [Line Items]
Notional Amount		$ 125.0	125.0
Strike (percent)	1.88%	1.88%
Fair Value - asset (liability)		$ 2.3	(7.9)
Forward-starting swap, hybrid debt, maturity Jun 2033 3 | Designated as hedging instrument | Cash flow hedge
Derivative [Line Items]
Notional Amount		$ 75.0	75.0
Strike (percent)	2.00%	2.00%
Fair Value - asset (liability)		$ 1.3	$ (4.9)
Treasury rate locks | Cash flow hedge
Derivative [Line Items]
Number of derivative instruments | derivative				5
Forward starting swaps | Cash flow hedge
Derivative [Line Items]
Number of derivative instruments | derivative	6	6

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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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