Significant Accounting Policies Lease Asset and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Leased Assets [Line Items]
Operating Lease, Right-of-Use Asset	$ 114.1	$ 114.1	$ 0.0
Intangible Assets, Net (Excluding Goodwill)	758.5	733.9	733.2
Other Assets, Noncurrent	18.0	21.7	37.0
Total Assets	4,859.9	4,544.7	4,445.2
Operating Lease, Liability, Current	28.3	29.8	0.0
Operating Lease, Liability, Noncurrent	$ 71.3	69.7	0.0
Liabilities		2,902.0	$ 2,802.5
Adjustments for New Accounting Pronouncement [Member]
Operating Leased Assets [Line Items]
Operating Lease, Right-of-Use Asset		114.1
Intangible Assets, Net (Excluding Goodwill)		0.7
Other Assets, Noncurrent		15.3
Total Assets		99.5
Operating Lease, Liability, Current		29.8
Operating Lease, Liability, Noncurrent		69.7
Liabilities		$ 99.5