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Changes in Accounting Policies - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease of retained earnings	$ (2,661.5)		$ (1,467.7)	$ (1,197.2)	$ (1,083.2)
Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease of retained earnings	$ (1,838.2)		(1,401.8)	(1,162.1)	(922.7)
Cumulative Effect, Period of Adoption, Adjustment | Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease of retained earnings		$ 4.8	$ 4.8	$ (0.9)	$ (1.4)

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