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Noncontrolling Interests Redeemable interest in property partnership (Narrative) (Details) - Fountain Square [Member] - USD ($) $ in Millions | Sep. 15, 2015 | Aug. 06, 2015 | Oct. 04, 2012
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Noncontrolling Interest [Line Items] |  |  |
Aggregate purchase price |  |  | $ 385.0
Indebtedness assumed |  |  | $ 211.3
Ownership Percentage | 50.00% | 50.00% | 50.00%
Fixed Price to Acquire Remaining Portion of Joint venture |  | $ 100.9 |
Payments to Acquire Businesses, Gross |  |  | $ 87.0
Ownership Percentage by the Company |  |  | 50.00%
Future Fixed Price to Acquire Remaining Portion of Joint venture |  |  | $ 102.0
Fixed Price Option Expiration Date |  |  | Jan. 31, 2016
Payments for Repurchase of Redeemable Noncontrolling Interest | $ 100.9 |  |
Mortgage debt assumed upon acquisition of noncontrolling interest | $ 105.6 |  |

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