Recently Issued and Adopted Accounting Pronouncements and Regulatory Items Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax effects reclassified from AOCI to retained earnings	$ 53.1	$ (53.1)
Lease asset		164.7
Present value of lease liabilities		194.7
Prepaid and other current assets		$ 487.5	$ 432.6
Adoption of accounting standard	2.4
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standard	55.5
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease asset	185.3
Present value of lease liabilities	215.9
Prepaid and other current assets	(30.6)
Accounting Standards Update 2016-02 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standard	$ 2.4